--- a/chrome/browser/media/router/media_router_feature.cc	
2018-05-20 13:30:39.941668362 -0400
+++ b/chrome/browser/media/router/media_router_feature.cc.new	
2018-05-20 13:33:31.976474960 -0400
@@ -16,21 +16,16 @@
 #include "services/network/public/cpp/features.h"
 #include "ui/base/ui_features.h"
 
-#if defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/pref_names.h"
 #include "components/prefs/pref_service.h"
 #include "components/user_prefs/user_prefs.h"
 #include "ui/base/ui_base_features.h"
-#endif  // defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 
-#if !defined(OS_ANDROID)
 #include "components/prefs/pref_registry_simple.h"
-#endif
 
 namespace media_router {
 
-#if !defined(OS_ANDROID)
 // Controls if browser side DialMediaRouteProvider is enabled.
 const base::Feature kDialMediaRouteProvider{"DialMediaRouteProvider",
                                             base::FEATURE_DISABLED_BY_DEFAULT};
@@ -42,9 +37,7 @@
 const base::Feature kCastMediaRouteProvider{"CastMediaRouteProvider",
                                             base::FEATURE_DISABLED_BY_DEFAULT};
 
-#endif
 
-#if defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 namespace {
 const PrefService::Preference* GetMediaRouterPref(
     content::BrowserContext* context) {
@@ -52,10 +45,8 @@
       ::prefs::kEnableMediaRouter);
 }
 }  // namespace
-#endif  // defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 
 bool MediaRouterEnabled(content::BrowserContext* context) {
-#if defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
   const PrefService::Preference* pref = GetMediaRouterPref(context);
   // Only use the pref value if it set from a mandatory policy.
   if (pref->IsManaged() && !pref->IsDefaultValue()) {
@@ -66,13 +57,9 @@
 
   // The component extension cannot be loaded in guest sessions.
   // TODO(crbug.com/756243): Figure out why.
-  return !Profile::FromBrowserContext(context)->IsGuestSession();
-#else  // !(defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS))
   return false;
-#endif  // defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 }
 
-#if !defined(OS_ANDROID)
 void RegisterLocalStatePrefs(PrefRegistrySimple* registry) {
   registry->RegisterBooleanPref(prefs::kMediaRouterCastAllowAllIPs, false,
                                 PrefRegistry::PUBLIC);
@@ -135,19 +122,8 @@
 }
 
 bool ShouldUseViewsDialog() {
-#if defined(OS_MACOSX)
-#if BUILDFLAG(MAC_VIEWS_BROWSER)
-  // Cocoa browser is disabled if kExperimentalUi is enabled.
-  return (base::FeatureList::IsEnabled(features::kViewsCastDialog) &&
-          !features::IsViewsBrowserCocoa()) ||
-         base::FeatureList::IsEnabled(features::kExperimentalUi);
-#else   // !BUILDFLAG(MAC_VIEWS_BROWSER)
-  return false;
-#endif  // BUILDFLAG(MAC_VIEWS_BROWSER)
-#else   // !defined(OS_MACOSX)
   return base::FeatureList::IsEnabled(features::kViewsCastDialog) ||
          base::FeatureList::IsEnabled(features::kExperimentalUi);
-#endif  // defined(OS_MACOSX)
 }
 
 bool ShouldUseMirroringService() {
@@ -157,6 +133,5 @@
          base::FeatureList::IsEnabled(network::features::kNetworkService);
 }
 
-#endif  // !defined(OS_ANDROID)
 
 }  // namespace media_router