[Media Router] Remove the extension ID getter from MRMojoImpl

chrome/browser/ui/webui/media_router/media_router_ui.cc

 // Copyright 2015 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/ui/webui/media_router/media_router_ui.h"
 
 #include <algorithm>
 #include <string>
 #include <unordered_map>
 #include <utility>
 
 #include "base/guid.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/media/router/create_presentation_connection_request.h"
+#include "chrome/browser/media/router/event_page_request_manager.h"
+#include "chrome/browser/media/router/event_page_request_manager_factory.h"
 #include "chrome/browser/media/router/issues_observer.h"
 #include "chrome/browser/media/router/media_router.h"
 #include "chrome/browser/media/router/media_router_factory.h"
 #include "chrome/browser/media/router/media_router_feature.h"
 #include "chrome/browser/media/router/media_router_metrics.h"
 #include "chrome/browser/media/router/media_routes_observer.h"
 #include "chrome/browser/media/router/media_sinks_observer.h"
 #include "chrome/browser/media/router/mojo/media_router_mojo_impl.h"
 #include "chrome/browser/media/router/presentation_service_delegate_impl.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 192 matching lines @@
   auto handler = base::MakeUnique<MediaRouterWebUIMessageHandler>(this);
   handler_ = handler.get();
 
   // Create a WebUIDataSource containing the chrome://media-router page's
   // content.
   std::unique_ptr<content::WebUIDataSource> html_source(
       content::WebUIDataSource::Create(chrome::kChromeUIMediaRouterHost));
 
   content::WebContents* wc = web_ui->GetWebContents();
   DCHECK(wc);
+  content::BrowserContext* context = wc->GetBrowserContext();
 
-  router_ =
-      MediaRouterFactory::GetApiForBrowserContext(wc->GetBrowserContext());
+  router_ = MediaRouterFactory::GetApiForBrowserContext(context);
+  event_page_request_manager_ =
+      EventPageRequestManagerFactory::GetApiForBrowserContext(context);
 
   // Allows UI to load extensionview.
   // TODO(haibinlu): limit object-src to current extension once crbug/514866
   // is fixed.
   html_source->OverrideContentSecurityPolicyObjectSrc("object-src chrome:;");
 
   AddLocalizedStrings(html_source.get());
   AddMediaRouterUIResources(html_source.get());
   // Ownership of |html_source| is transferred to the BrowserContext.
   content::WebUIDataSource::Add(Profile::FromWebUI(web_ui),
@@ skipping 605 matching lines @@
              ? GetExtensionName(gurl, extensions::ExtensionRegistry::Get(
                                           Profile::FromWebUI(web_ui())))
              : TruncateHost(GetHostFromURL(gurl));
 }
 
 const std::set<MediaCastMode>& MediaRouterUI::cast_modes() const {
   return cast_modes_;
 }
 
 const std::string& MediaRouterUI::GetRouteProviderExtensionId() const {
-  // TODO(crbug.com/597778): remove reference to MediaRouterMojoImpl
-  return static_cast<MediaRouterMojoImpl*>(router_)
-      ->media_route_provider_extension_id();
+  return event_page_request_manager_->media_route_provider_extension_id();
 }
 
 void MediaRouterUI::SetUIInitializationTimer(const base::Time& start_time) {
   DCHECK(!start_time.is_null());
   start_time_ = start_time;
 }
 
 void MediaRouterUI::OnUIInitiallyLoaded() {
   if (!start_time_.is_null()) {
     MediaRouterMetrics::RecordMediaRouterDialogPaint(base::Time::Now() -
@@ skipping 47 matching lines @@
 }
 
 std::string MediaRouterUI::GetSerializedInitiatorOrigin() const {
   url::Origin origin = initiator_
                            ? url::Origin(initiator_->GetLastCommittedURL())
                            : url::Origin();
   return origin.Serialize();
 }
 
 }  // namespace media_router