Move enable_webrtc to a buildflag header.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 93c9fd00a34af0863dd0e57dcae89ad95511755d..1b13b14c94d6c5d16b555d3f70f1636191661c2e 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -30,6 +30,7 @@
 #include "content/public/common/service_manager_connection.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_platform_file.h"
+#include "media/media_features.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
 #include "mojo/public/cpp/bindings/associated_binding_set.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
@@ -55,7 +56,7 @@ class ChildConnection;
 class InProcessChildThreadParams;
 class MessagePortMessageFilter;
 class NotificationMessageFilter;
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 class P2PSocketDispatcherHost;
 #endif
 class PermissionServiceContext;
@@ -142,7 +143,7 @@ class CONTENT_EXPORT RenderProcessHostImpl
   bool FastShutdownStarted() const override;
   base::TimeDelta GetChildProcessIdleTime() const override;
   void FilterURL(bool empty_allowed, GURL* url) override;
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   void EnableAudioDebugRecordings(const base::FilePath& file) override;
   void DisableAudioDebugRecordings() override;
   bool StartWebRTCEventLog(const base::FilePath& file_path) override;
@@ -369,7 +370,7 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // GpuSwitchingObserver implementation.
   void OnGpuSwitched() override;
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   void OnRegisterAecDumpConsumer(int id);
   void OnUnregisterAecDumpConsumer(int id);
   void RegisterAecDumpConsumerOnUIThread(int id);
@@ -533,7 +534,7 @@ class CONTENT_EXPORT RenderProcessHostImpl
 
   scoped_refptr<AudioInputRendererHost> audio_input_renderer_host_;
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   scoped_refptr<P2PSocketDispatcherHost> p2p_socket_dispatcher_host_;
 
   // Must be accessed on UI thread.