Move enable_webrtc to a buildflag header.

content/public/test/mock_render_process_host.h

Index: content/public/test/mock_render_process_host.h
diff --git a/content/public/test/mock_render_process_host.h b/content/public/test/mock_render_process_host.h
index f83327cf4b4d18629105adcbb5ebaee35fd77a6e..9579aabf4cd146f6238db79fe7884f9ef2fe15d2 100644
--- a/content/public/test/mock_render_process_host.h
+++ b/content/public/test/mock_render_process_host.h
@@ -17,6 +17,7 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_process_host_factory.h"
 #include "ipc/ipc_test_sink.h"
+#include "media/media_features.h"
 #include "mojo/public/cpp/bindings/associated_interface_ptr.h"
 #include "services/service_manager/public/cpp/interface_provider.h"
 
@@ -81,7 +82,7 @@ class MockRenderProcessHost : public RenderProcessHost {
   bool FastShutdownForPageCount(size_t count) 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;