Move enable_webrtc to a buildflag header.

content/browser/frame_host/render_frame_host_impl.cc

 // Copyright 2013 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.
 
 #include "content/browser/frame_host/render_frame_host_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 2248 matching lines @@
   GetInterfaceRegistry()->AddInterface<device::mojom::VRService>(
       base::Bind(&device::VRServiceImpl::BindRequest));
 #endif
   if (base::FeatureList::IsEnabled(features::kGenericSensor)) {
     GetInterfaceRegistry()->AddInterface(
         base::Bind(&device::SensorProviderImpl::Create,
                    BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE)),
         BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
   }
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   // BrowserMainLoop::GetInstance() may be null on unit tests.
   if (BrowserMainLoop::GetInstance()) {
     // BrowserMainLoop, which owns MediaStreamManager, is alive for the lifetime
     // of Mojo communication (see BrowserMainLoop::ShutdownThreadsAndCleanUp(),
     // which shuts down Mojo). Hence, passing that MediaStreamManager instance
     // as a raw pointer here is safe.
     MediaStreamManager* media_stream_manager =
         BrowserMainLoop::GetInstance()->media_stream_manager();
     GetInterfaceRegistry()->AddInterface(
         base::Bind(&MediaDevicesDispatcherHost::Create, GetProcess()->GetID(),
@@ skipping 1024 matching lines @@
   // There is no pending NavigationEntry in these cases, so pass 0 as the
   // pending_nav_entry_id. If the previous handle was a prematurely aborted
   // navigation loaded via LoadDataWithBaseURL, propagate the entry id.
   return NavigationHandleImpl::Create(
       params.url, frame_tree_node_, is_renderer_initiated,
       params.was_within_same_page, params.is_srcdoc, base::TimeTicks::Now(),
       entry_id_for_data_nav, false);  // started_from_context_menu
 }
 
 }  // namespace content