Remove third-party dependencies in rand_util.h and friends

We remove dependencies on chromium's third_party/lss and
third_party/boringssl/src/include/openssl.
---
 base/rand_util.h        |  6 ++++++
 base/rand_util_posix.cc | 16 ++++++++++++++++
 base/rand_util_win.cc   |  6 ++++++
 3 files changed, 28 insertions(+)

diff --git a/base/rand_util.h b/base/rand_util.h
index c9dd1249660c..c9ffa1d588fc 100644
--- a/base/rand_util.h
+++ b/base/rand_util.h
@@ -16,9 +16,11 @@
 #include "base/gtest_prod_util.h"
 #include "build/build_config.h"
 
+#if !defined(MOZ_ZUCCHINI)
 #if !BUILDFLAG(IS_NACL)
 #include "third_party/boringssl/src/include/openssl/rand.h"
 #endif
+#endif  // !defined(MOZ_ZUCCHINI)
 
 namespace memory_simulator {
 class MemoryHolder;
@@ -34,9 +36,11 @@ namespace internal {
 void ConfigureRandBytesFieldTrial();
 #endif
 
+#if !defined(MOZ_ZUCCHINI)
 #if !BUILDFLAG(IS_NACL)
 void ConfigureBoringSSLBackedRandBytesFieldTrial();
 #endif
+#endif  // !defined(MOZ_ZUCCHINI)
 
 // Returns a random double in range [0, 1). For use in allocator shim to avoid
 // infinite recursion. Thread-safe.
@@ -97,6 +101,7 @@ class RandomBitGenerator {
   ~RandomBitGenerator() = default;
 };
 
+#if !defined(MOZ_ZUCCHINI)
 #if !BUILDFLAG(IS_NACL)
 class NonAllocatingRandomBitGenerator {
  public:
@@ -114,6 +119,7 @@ class NonAllocatingRandomBitGenerator {
   ~NonAllocatingRandomBitGenerator() = default;
 };
 #endif
+#endif  // !defined(MOZ_ZUCCHINI)
 
 // Shuffles [first, last) randomly. Thread-safe.
 template <typename Itr>
diff --git a/base/rand_util_posix.cc b/base/rand_util_posix.cc
index 4982a4556f24..3c88dec2abf1 100644
--- a/base/rand_util_posix.cc
+++ b/base/rand_util_posix.cc
@@ -14,26 +14,34 @@
 
 #include "base/check.h"
 #include "base/compiler_specific.h"
+#if !defined(MOZ_ZUCCHINI)
 #include "base/feature_list.h"
+#endif  // !defined(MOZ_ZUCCHINI)
 #include "base/files/file_util.h"
+#if !defined(MOZ_ZUCCHINI)
 #include "base/metrics/histogram_macros.h"
+#endif  // !defined(MOZ_ZUCCHINI)
 #include "base/no_destructor.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 
 #if (BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)) && !BUILDFLAG(IS_NACL)
+#if !defined(MOZ_ZUCCHINI)
 #include "third_party/lss/linux_syscall_support.h"
+#endif  // !defined(MOZ_ZUCCHINI)
 #elif BUILDFLAG(IS_MAC)
 // TODO(crbug.com/995996): Waiting for this header to appear in the iOS SDK.
 // (See below.)
 #include <sys/random.h>
 #endif
 
+#if !defined(MOZ_ZUCCHINI)
 #if !BUILDFLAG(IS_NACL)
 #include "third_party/boringssl/src/include/openssl/crypto.h"
 #include "third_party/boringssl/src/include/openssl/rand.h"
 #endif
+#endif  // !defined(MOZ_ZUCCHINI)
 
 namespace base {
 
@@ -64,6 +72,7 @@ class URandomFd {
   const int fd_;
 };
 
+#if !defined(MOZ_ZUCCHINI)
 #if (BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || \
      BUILDFLAG(IS_ANDROID)) &&                        \
     !BUILDFLAG(IS_NACL)
@@ -136,9 +145,11 @@ bool UseGetrandom() {
   return true;
 }
 #endif
+#endif  // !defined(MOZ_ZUCCHINI)
 
 }  // namespace
 
+#if !defined(MOZ_ZUCCHINI)
 namespace internal {
 
 #if BUILDFLAG(IS_ANDROID)
@@ -172,10 +183,12 @@ bool UseBoringSSLForRandBytes() {
 #endif
 
 }  // namespace internal
+#endif  // !defined(MOZ_ZUCCHINI)
 
 namespace {
 
 void RandBytes(void* output, size_t output_length, bool avoid_allocation) {
+#if !defined(MOZ_ZUCCHINI)
 #if !BUILDFLAG(IS_NACL)
   // The BoringSSL experiment takes priority over everything else.
   if (!avoid_allocation && internal::UseBoringSSLForRandBytes()) {
@@ -186,9 +199,11 @@ void RandBytes(void* output, size_t output_length, bool avoid_allocation) {
     return;
   }
 #endif
+#endif  // !defined(MOZ_ZUCCHINI)
 #if (BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || \
      BUILDFLAG(IS_ANDROID)) &&                        \
     !BUILDFLAG(IS_NACL)
+#if !defined(MOZ_ZUCCHINI)
   if (avoid_allocation || UseGetrandom()) {
     // On Android it is mandatory to check that the kernel _version_ has the
     // support for a syscall before calling. The same check is made on Linux and
@@ -197,6 +212,7 @@ void RandBytes(void* output, size_t output_length, bool avoid_allocation) {
     if (kernel_has_support && GetRandomSyscall(output, output_length))
       return;
   }
+#endif  // !defined(MOZ_ZUCCHINI)
 #elif BUILDFLAG(IS_MAC)
   // TODO(crbug.com/995996): Enable this on iOS too, when sys/random.h arrives
   // in its SDK.
diff --git a/base/rand_util_win.cc b/base/rand_util_win.cc
index 549f4362af8b..c0df55734def 100644
--- a/base/rand_util_win.cc
+++ b/base/rand_util_win.cc
@@ -14,9 +14,11 @@
 #include <limits>
 
 #include "base/check.h"
+#if !defined(MOZ_ZUCCHINI)
 #include "base/feature_list.h"
 #include "third_party/boringssl/src/include/openssl/crypto.h"
 #include "third_party/boringssl/src/include/openssl/rand.h"
+#endif  // !defined(MOZ_ZUCCHINI)
 
 // Prototype for ProcessPrng.
 // See: https://learn.microsoft.com/en-us/windows/win32/seccng/processprng
@@ -26,6 +28,7 @@ BOOL WINAPI ProcessPrng(PBYTE pbData, SIZE_T cbData);
 
 namespace base {
 
+#if !defined(MOZ_ZUCCHINI)
 namespace internal {
 
 namespace {
@@ -50,6 +53,7 @@ bool UseBoringSSLForRandBytes() {
 }
 
 }  // namespace internal
+#endif  // !defined(MOZ_ZUCCHINI)
 
 namespace {
 
@@ -66,6 +70,7 @@ decltype(&ProcessPrng) GetProcessPrng() {
 }
 
 void RandBytes(void* output, size_t output_length, bool avoid_allocation) {
+#if !defined(MOZ_ZUCCHINI)
   if (!avoid_allocation && internal::UseBoringSSLForRandBytes()) {
     // Ensure BoringSSL is initialized so it can use things like RDRAND.
     CRYPTO_library_init();
@@ -73,6 +78,7 @@ void RandBytes(void* output, size_t output_length, bool avoid_allocation) {
     (void)RAND_bytes(static_cast<uint8_t*>(output), output_length);
     return;
   }
+#endif  // !defined(MOZ_ZUCCHINI)
 
   static decltype(&ProcessPrng) process_prng_fn = GetProcessPrng();
   BOOL success = process_prng_fn(static_cast<BYTE*>(output), output_length);
-- 
2.42.0.windows.2