[Media Router] Add experiment control logic.

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2012 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 "chrome/browser/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 251 matching lines @@
 
 #if defined(USE_BROWSER_SPELLCHECKER)
 #include "chrome/browser/spellchecker/spellcheck_message_filter_platform.h"
 #endif
 
 #if defined(ENABLE_WEBRTC)
 #include "chrome/browser/media/webrtc_logging_handler_host.h"
 #endif
 
 #if defined(ENABLE_MEDIA_ROUTER)
+#include "chrome/browser/media/router/media_router_feature.h"
 #include "chrome/browser/media/router/presentation_service_delegate_impl.h"
 #endif
 
 using base::FileDescriptor;
 using blink::WebWindowFeatures;
 using content::AccessTokenStore;
 using content::BrowserThread;
 using content::BrowserURLHandler;
 using content::ChildProcessSecurityPolicy;
 using content::QuotaPermissionContext;
@@ skipping 2331 matching lines @@
       browser_context, params, callback);
 #else
   NOTIMPLEMENTED();
 #endif
 }
 
 content::PresentationServiceDelegate*
 ChromeContentBrowserClient::GetPresentationServiceDelegate(
       content::WebContents* web_contents) {
 #if defined(ENABLE_MEDIA_ROUTER)
-  if (switches::MediaRouterEnabled() &&
+  if (media_router::MediaRouterEnabled() &&
       !web_contents->GetBrowserContext()->IsOffTheRecord()) {
     return media_router::PresentationServiceDelegateImpl::
         GetOrCreateForWebContents(web_contents);
   }
 #endif
   return nullptr;
 }
 
 void ChromeContentBrowserClient::RecordURLMetric(const std::string& metric,
                                                  const GURL& url) {
@@ skipping 117 matching lines @@
   if (channel <= kMaxDisableEncryptionChannel) {
     static const char* const kWebRtcDevSwitchNames[] = {
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)