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

chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac_browsertest.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 15 matching lines @@
 class AppShimMenuControllerBrowserTest
     : public extensions::PlatformAppBrowserTest {
  protected:
   AppShimMenuControllerBrowserTest()
       : app_1_(NULL),
         app_2_(NULL),
         initial_menu_item_count_(0) {}
 
   virtual ~AppShimMenuControllerBrowserTest() {}
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     PlatformAppBrowserTest::SetUpCommandLine(command_line);
   }
 
   // Start two apps and wait for them to be launched.
   void SetUpApps() {
     ExtensionTestMessageListener listener_1("Launched", false);
     app_1_ = InstallAndLaunchPlatformApp("minimal_id");
     ASSERT_TRUE(listener_1.WaitUntilSatisfied());
     ExtensionTestMessageListener listener_2("Launched", false);
     app_2_ = InstallAndLaunchPlatformApp("minimal");
@@ skipping 102 matching lines @@
 
   CheckHasAppMenus(app_1_);
   ExtensionService::UninstallExtensionHelper(
       extension_service(),
       app_1_->id(),
       extensions::UNINSTALL_REASON_FOR_TESTING);
   CheckNoAppMenus();
 }
 
 }  // namespace