Use mojo volume interfaces for mash and classic ash.

chrome/browser/chromeos/chrome_interface_factory.cc

Index: chrome/browser/chromeos/chrome_interface_factory.cc
diff --git a/chrome/browser/chromeos/chrome_interface_factory.cc b/chrome/browser/chromeos/chrome_interface_factory.cc
index 2a8fdb2242fa04b928215b70abfefbe8f8e14be6..1d5dabd421d94209a78ffb051076291aaf007f9c 100644
--- a/chrome/browser/chromeos/chrome_interface_factory.cc
+++ b/chrome/browser/chromeos/chrome_interface_factory.cc
@@ -19,6 +19,7 @@
 #include "chrome/browser/ui/ash/chrome_wallpaper_manager.h"
 #include "chrome/browser/ui/ash/keyboard_ui_service.h"
 #include "chrome/browser/ui/ash/system_tray_client.h"
+#include "chrome/browser/ui/ash/volume_controller_chromeos.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "content/public/common/service_manager_connection.h"
@@ -127,6 +128,12 @@ class FactoryImpl {
     wallpaper_manager_->ProcessRequest(std::move(request));
   }
 
+  void BindRequest(ash::mojom::VolumeControllerRequest request) {
+    if (!volume_controller_)
+      volume_controller_.reset(new VolumeController);

[sky, 2016/10/19 15:26:39]

MakeUnique if possible.

[msw, 2016/10/19 22:36:25]

Done (here and elsewhere).

+    volume_controller_->BindRequest(std::move(request));
+  }
+
   void BindRequest(app_list::mojom::AppListPresenterRequest request) {
     if (!app_list_presenter_service_)
       app_list_presenter_service_.reset(new AppListPresenterService);
@@ -141,6 +148,7 @@ class FactoryImpl {
   std::unique_ptr<ChromeLaunchable> launchable_;
   mojo::BindingSet<ash::mojom::SystemTrayClient> system_tray_client_bindings_;
   std::unique_ptr<ChromeWallpaperManager> wallpaper_manager_;
+  std::unique_ptr<VolumeController> volume_controller_;
   std::unique_ptr<AppListPresenterService> app_list_presenter_service_;
   mojo::BindingSet<app_list::mojom::AppListPresenter>
       app_list_presenter_bindings_;
@@ -168,6 +176,8 @@ bool ChromeInterfaceFactory::OnConnect(
                                                    main_thread_task_runner_);
   FactoryImpl::AddFactory<ash::mojom::SystemTrayClient>(
       registry, main_thread_task_runner_);
+  FactoryImpl::AddFactory<ash::mojom::VolumeController>(
+      registry, main_thread_task_runner_);
   FactoryImpl::AddFactory<ash::mojom::WallpaperManager>(
       registry, main_thread_task_runner_);
   FactoryImpl::AddFactory<app_list::mojom::AppListPresenter>(