Make callers of CommandLine use it via the base:: namespace.

chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac_interactive_uitest.cc

 // Copyright 2014 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/cocoa/apps/quit_with_apps_controller_mac.h"
 
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "chrome/browser/apps/app_window_registry_util.h"
@@ skipping 16 matching lines @@
 
 namespace {
 
 class QuitWithAppsControllerInteractiveTest
     : public extensions::PlatformAppBrowserTest {
  protected:
   QuitWithAppsControllerInteractiveTest() : app_(NULL) {}
 
   virtual ~QuitWithAppsControllerInteractiveTest() {}
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     PlatformAppBrowserTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kAppsKeepChromeAliveInTests);
   }
 
   const extensions::Extension* app_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuitWithAppsControllerInteractiveTest);
 };
 
@@ skipping 83 matching lines @@
   // Clicking "Quit All Apps." button closes all app windows. With no browsers
   // open, this should also quit Chrome.
   content::WindowedNotificationObserver quit_observer(
       chrome::NOTIFICATION_APP_TERMINATING,
       content::NotificationService::AllSources());
   notification->delegate()->ButtonClick(0);
   message_center->RemoveAllNotifications(false);
   EXPECT_FALSE(AppWindowRegistryUtil::IsAppWindowRegisteredInAnyProfile(0));
   quit_observer.Wait();
 }