Move enable_webrtc to a buildflag header.

content/browser/gpu/gpu_data_manager_impl_private.cc

Index: content/browser/gpu/gpu_data_manager_impl_private.cc
diff --git a/content/browser/gpu/gpu_data_manager_impl_private.cc b/content/browser/gpu/gpu_data_manager_impl_private.cc
index 0414f6c311072b1baa3d6ae9176e1ab0f6c7f3d4..3adc3f74831091cf89aa004cbb90b4c8add87ed4 100644
--- a/content/browser/gpu/gpu_data_manager_impl_private.cc
+++ b/content/browser/gpu/gpu_data_manager_impl_private.cc
@@ -40,6 +40,7 @@
 #include "gpu/config/gpu_util.h"
 #include "gpu/ipc/common/memory_stats.h"
 #include "gpu/ipc/service/switches.h"
+#include "media/media_features.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_switches.h"
@@ -689,7 +690,7 @@ void GpuDataManagerImplPrivate::AppendRendererCommandLine(
 
   if (ShouldDisableAcceleratedVideoDecode(command_line))
     command_line->AppendSwitch(switches::kDisableAcceleratedVideoDecode);
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_ENCODE) &&
       !command_line->HasSwitch(switches::kDisableWebRtcHWEncoding))
     command_line->AppendSwitch(switches::kDisableWebRtcHWEncoding);
@@ -772,7 +773,7 @@ void GpuDataManagerImplPrivate::AppendGpuCommandLine(
   }
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_ENCODE) &&
       !command_line->HasSwitch(switches::kDisableWebRtcHWEncoding)) {
     if (gpu_preferences) {