Move enable_webrtc to a buildflag header.

gpu/command_buffer/service/gpu_preferences.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/gpu_export.h"
+#include "media/media_features.h"
 
 namespace gpu {
 
 struct GPU_EXPORT GpuPreferences {
  public:
   GpuPreferences();
 
   GpuPreferences(const GpuPreferences& other);
 
   ~GpuPreferences();
@@ skipping 20 matching lines @@
   bool ui_prioritize_in_gpu_process = false;
 
   // Disables hardware acceleration of video decode, where available.
   bool disable_accelerated_video_decode = false;
 
 #if defined(OS_CHROMEOS)
   // Disables VA-API accelerated video encode.
   bool disable_vaapi_accelerated_video_encode = false;
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   // Disables HW encode acceleration for WebRTC.
   bool disable_web_rtc_hw_encoding = false;
 #endif
 
 #if defined(OS_WIN)
   // Enables experimental hardware acceleration for VP8/VP9 video decoding.
   // Bitmask - 0x1=Microsoft, 0x2=AMD, 0x03=Try all.
   VpxDecodeVendors enable_accelerated_vpx_decode = VPX_VENDOR_MICROSOFT;
 
   // Enables using CODECAPI_AVLowLatencyMode.
@@ skipping 76 matching lines @@
   bool enable_es3_apis = true;
 
   // Use the Pass-through command decoder, skipping all validation and state
   // tracking.
   bool use_passthrough_cmd_decoder = false;
 };
 
 }  // namespace gpu
 
 #endif // GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_