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

chrome/browser/apps/speech_recognition_browsertest.cc

 // 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.
 
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/fake_speech_recognition_manager.h"
 #include "media/base/media_switches.h"
 
 class SpeechRecognitionTest : public extensions::PlatformAppBrowserTest {
@@ skipping 13 matching lines @@
       fake_speech_recognition_manager_->set_should_send_fake_response(true);
       // Inject the fake manager factory so that the test result is returned to
       // the web page.
       content::SpeechRecognitionManager::SetManagerForTesting(
           fake_speech_recognition_manager_.get());
     }
 
     extensions::PlatformAppBrowserTest::SetUp();
   }
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(switches::kUseFakeDeviceForMediaStream);
     command_line->AppendSwitch(switches::kUseFakeUIForMediaStream);
     extensions::PlatformAppBrowserTest::SetUpCommandLine(command_line);
   }
 
  private:
   scoped_ptr<content::FakeSpeechRecognitionManager>
       fake_speech_recognition_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionTest);
 };
 
 IN_PROC_BROWSER_TEST_F(SpeechRecognitionTest, SpeechFromBackgroundPage) {
   ASSERT_TRUE(RunPlatformAppTest("platform_apps/speech/background_page"))
       << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(SpeechRecognitionTest,
                        SpeechFromBackgroundPageWithoutPermission) {
   ASSERT_TRUE(
       RunPlatformAppTest("platform_apps/speech/background_page_no_permission"))
           << message_;
 }