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

chrome/browser/chromeos/login/login_ui_keyboard_browsertest.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 "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/input_method/input_method_persistence.h"
 #include "chrome/browser/chromeos/language_preferences.h"
 #include "chrome/browser/chromeos/login/login_manager_test.h"
@@ skipping 160 matching lines @@
                 ->GetActiveIMEState()
                 ->GetCurrentInputMethod()
                 .id());
 }
 
 class LoginUIKeyboardTestWithUsersAndOwner : public chromeos::LoginManagerTest {
  public:
   LoginUIKeyboardTestWithUsersAndOwner() : LoginManagerTest(false) {}
   virtual ~LoginUIKeyboardTestWithUsersAndOwner() {}
 
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  virtual void SetUpCommandLine(base::CommandLine* command_line) override {
     LoginManagerTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kStubCrosSettings);
 
     LoginManagerTest::SetUpCommandLine(command_line);
   }
 
   virtual void SetUpOnMainThread() override {
     user_input_methods.push_back("xkb:fr::fra");
     user_input_methods.push_back("xkb:de::ger");
     user_input_methods.push_back("xkb:pl::pol");
@@ skipping 77 matching lines @@
   // Switch back.
   js_checker().Evaluate("$('cancel-add-user-button').click()");
   OobeScreenWaiter(OobeDisplay::SCREEN_ACCOUNT_PICKER).Wait();
 
   EXPECT_EQ(expected_input_methods,
             input_method::InputMethodManager::Get()
                 ->GetActiveIMEState()
                 ->GetActiveInputMethodIds());
 }
 }  // namespace chromeos