Remove dependencies on /media for iOS.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 5f99db5e32efe22f57866734d45d48f4e8bbd01f..67c32f28bacaed1cfc9d99a8501426734554f0f0 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -402,6 +402,7 @@ void BrowserMainLoop::MainMessageLoopStart() {
     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
   }
 
+#if !defined(OS_IOS)
   {
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures")
     media::InitializeCPUSpecificMediaFeatures();
@@ -414,8 +415,6 @@ void BrowserMainLoop::MainMessageLoopStart() {
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MIDIManager")
     midi_manager_.reset(media::MIDIManager::Create());
   }
-
-#if !defined(OS_IOS)
   {
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:ContentWebUIController")
     WebUIControllerFactory::RegisterFactory(