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

chrome/browser/chromeos/system/tray_accessibility_browsertest.cc

 // Copyright (c) 2012 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 "ash/magnifier/magnification_controller.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray_accessibility.h"
 #include "ash/system/user/login_status.h"
 #include "ash/test/shell_test_api.h"
@@ skipping 57 matching lines @@
   // The profile which should be used by these tests.
   Profile* GetProfile() { return ProfileManager::GetActiveUserProfile(); }
 
   virtual void SetUpInProcessBrowserTestFixture() override {
     EXPECT_CALL(provider_, IsInitializationComplete(_))
         .WillRepeatedly(Return(true));
     policy::BrowserPolicyConnector::SetPolicyProviderForTesting(&provider_);
     AccessibilityManager::SetBrailleControllerForTest(&braille_controller_);
   }
 
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  virtual void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(switches::kLoginManager);
     command_line->AppendSwitchASCII(switches::kLoginProfile,
                                     TestingProfile::kTestUserProfileDir);
   }
 
   virtual void SetUpOnMainThread() override {
     AccessibilityManager::Get()->SetProfileForTest(GetProfile());
     MagnificationManager::Get()->SetProfileForTest(GetProfile());
   }
 
@@ skipping 820 matching lines @@
   EXPECT_FALSE(IsSettingsShownOnDetailMenu());
   CloseDetailMenu();
 }
 
 INSTANTIATE_TEST_CASE_P(TrayAccessibilityTestInstance,
                         TrayAccessibilityTest,
                         testing::Values(PREF_SERVICE,
                                         POLICY));
 
 }  // namespace chromeos