Move enable_webrtc to a buildflag header.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index da05c5ff6b54a849cce60518ba0aa959a9fc4018..7cf71b778f64c9b478808617ee1304e9dfdd81e3 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -99,6 +99,7 @@
 #include "content/renderer/websharedworker_proxy.h"
 #include "media/audio/audio_output_device.h"
 #include "media/base/media_switches.h"
+#include "media/media_features.h"
 #include "media/renderers/audio_renderer_impl.h"
 #include "media/renderers/gpu_video_accelerator_factories.h"
 #include "net/base/data_url.h"
@@ -193,7 +194,7 @@
 #include "content/renderer/pepper/pepper_plugin_registry.h"
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 #include "content/renderer/media/rtc_peer_connection_handler.h"
 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h"
 #endif
@@ -2342,7 +2343,7 @@ void RenderViewImpl::Close() {
 }
 
 void RenderViewImpl::OnPageWasHidden() {
-#if defined(OS_ANDROID) && defined(ENABLE_WEBRTC)
+#if defined(OS_ANDROID) && BUILDFLAG(ENABLE_WEBRTC)
   RenderThreadImpl::current()->video_capture_impl_manager()->
       SuspendDevices(true);
   if (speech_recognition_dispatcher_)
@@ -2362,7 +2363,7 @@ void RenderViewImpl::OnPageWasHidden() {
 }
 
 void RenderViewImpl::OnPageWasShown() {
-#if defined(OS_ANDROID) && defined(ENABLE_WEBRTC)
+#if defined(OS_ANDROID) && BUILDFLAG(ENABLE_WEBRTC)
   RenderThreadImpl::current()->video_capture_impl_manager()->
       SuspendDevices(false);
 #endif