Move enable_webrtc to a buildflag header.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 39292080edc53292143a9d17e006f2aea4b7d6eb..a9db38c4e80d175983907baad30eec1fc6eea026 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -173,6 +173,7 @@
 #include "ipc/ipc_channel_mojo.h"
 #include "ipc/ipc_logging.h"
 #include "media/base/media_switches.h"
+#include "media/media_features.h"
 #include "mojo/edk/embedder/embedder.h"
 #include "mojo/public/cpp/bindings/associated_interface_ptr.h"
 #include "net/url_request/url_request_context_getter.h"
@@ -230,7 +231,7 @@
 #include "content/browser/plugin_service_impl.h"
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 #include "content/browser/renderer_host/media/media_stream_track_metrics_host.h"
 #include "content/browser/renderer_host/p2p/socket_dispatcher_host.h"
 #include "content/browser/webrtc/webrtc_internals.h"
@@ -253,7 +254,7 @@ namespace {
 
 const char kSiteProcessMapKeyName[] = "content_site_process_map";
 
-#ifdef ENABLE_WEBRTC
+#if BUILDFLAG(ENABLE_WEBRTC)
 const base::FilePath::CharType kAecDumpFileNameAddition[] =
     FILE_PATH_LITERAL("aec_dump");
 #endif
@@ -292,7 +293,7 @@ void GetContexts(
       GetRequestContext(request_context, media_request_context, resource_type);
 }
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 
 // Creates a file used for handing over to the renderer.
 IPC::PlatformFileForTransit CreateFileForProcess(base::FilePath file_path) {
@@ -675,7 +676,7 @@ RenderProcessHostImpl::RenderProcessHostImpl(
       gpu_observer_registered_(false),
       delayed_cleanup_needed_(false),
       within_process_died_observer_(false),
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
       webrtc_eventlog_host_(id_),
 #endif
       max_worker_count_(0),
@@ -1083,7 +1084,7 @@ void RenderProcessHostImpl::CreateMessageFilters() {
       storage_partition_impl_->GetIndexedDBContext(),
       blob_storage_context.get()));
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   peer_connection_tracker_host_ = new PeerConnectionTrackerHost(
       GetID(), webrtc_eventlog_host_.GetWeakPtr());
   AddFilter(peer_connection_tracker_host_.get());
@@ -1149,7 +1150,7 @@ void RenderProcessHostImpl::CreateMessageFilters() {
           storage_partition_impl_->GetServiceWorkerContext()),
       message_port_message_filter_.get()));
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   p2p_socket_dispatcher_host_ = new P2PSocketDispatcherHost(
       resource_context, request_context.get());
   AddFilter(p2p_socket_dispatcher_host_.get());
@@ -1782,7 +1783,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
 #if BUILDFLAG(ENABLE_PLUGINS)
     switches::kEnablePepperTesting,
 #endif
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
     switches::kDisableWebRtcHWDecoding,
     switches::kDisableWebRtcHWEncoding,
     switches::kEnableWebRtcStunOrigin,
@@ -1833,7 +1834,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
         browser_cmd.GetSwitchValueASCII(switches::kTraceStartup));
   }
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   // Only run the Stun trials in the first renderer.
   if (!has_done_stun_trials &&
       browser_cmd.HasSwitch(switches::kWebRtcStunProbeTrialParameter)) {
@@ -1985,7 +1986,7 @@ bool RenderProcessHostImpl::OnMessageReceived(const IPC::Message& msg) {
       IPC_MESSAGE_HANDLER(ViewHostMsg_UserMetricsRecordAction,
                           OnUserMetricsRecordAction)
       IPC_MESSAGE_HANDLER(ViewHostMsg_Close_ACK, OnCloseACK)
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
       IPC_MESSAGE_HANDLER(AecDumpMsg_RegisterAecDumpConsumer,
                           OnRegisterAecDumpConsumer)
       IPC_MESSAGE_HANDLER(AecDumpMsg_UnregisterAecDumpConsumer,
@@ -2111,7 +2112,7 @@ void RenderProcessHostImpl::Cleanup() {
   if (!listeners_.IsEmpty() || worker_ref_count() != 0)
     return;
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   if (is_initialized_)
     ClearWebRtcLogMessageCallback();
 #endif
@@ -2216,7 +2217,7 @@ void RenderProcessHostImpl::FilterURL(bool empty_allowed, GURL* url) {
   FilterURL(this, empty_allowed, url);
 }
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 void RenderProcessHostImpl::EnableAudioDebugRecordings(
     const base::FilePath& file) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
@@ -2272,14 +2273,14 @@ bool RenderProcessHostImpl::StopWebRTCEventLog() {
 
 void RenderProcessHostImpl::SetWebRtcLogMessageCallback(
     base::Callback<void(const std::string&)> callback) {
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   BrowserMainLoop::GetInstance()->media_stream_manager()->
       RegisterNativeLogCallback(GetID(), callback);
 #endif
 }
 
 void RenderProcessHostImpl::ClearWebRtcLogMessageCallback() {
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   BrowserMainLoop::GetInstance()
       ->media_stream_manager()
       ->UnregisterNativeLogCallback(GetID());
@@ -2862,7 +2863,7 @@ void RenderProcessHostImpl::OnProcessLaunched() {
       observer.RenderProcessReady(this);
   }
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   if (WebRTCInternals::GetInstance()->IsAudioDebugRecordingsEnabled()) {
     EnableAudioDebugRecordings(
         WebRTCInternals::GetInstance()->GetAudioDebugRecordingsFilePath());
@@ -2904,7 +2905,7 @@ void RenderProcessHostImpl::OnGpuSwitched() {
   RecomputeAndUpdateWebKitPreferences();
 }
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 void RenderProcessHostImpl::OnRegisterAecDumpConsumer(int id) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
@@ -2968,7 +2969,7 @@ base::FilePath RenderProcessHostImpl::GetAecDumpFilePathWithExtensions(
   return file.AddExtension(IntToStringType(base::GetProcId(GetHandle())))
       .AddExtension(kAecDumpFileNameAddition);
 }
-#endif  // defined(ENABLE_WEBRTC)
+#endif  // BUILDFLAG(ENABLE_WEBRTC)
 
 void RenderProcessHostImpl::GetAudioOutputControllers(
     const GetAudioOutputControllersCallback& callback) const {