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

chrome/browser/ui/ash/keyboard_controller_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 "chrome/test/base/in_process_browser_test.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/base/ime/dummy_text_input_client.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/input_method_factory.h"
@@ skipping 11 matching lines @@
  public:
   VirtualKeyboardWebContentTest() {};
   virtual ~VirtualKeyboardWebContentTest() {};
 
   virtual void SetUp() override {
     ui::SetUpInputMethodFactoryForTesting();
     InProcessBrowserTest::SetUp();
   }
 
   // Ensure that the virtual keyboard is enabled.
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  virtual void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(
         keyboard::switches::kEnableVirtualKeyboard);
   }
 
   keyboard::KeyboardControllerProxy* proxy() {
     return keyboard::KeyboardController::GetInstance()->proxy();
   }
 
  protected:
   void FocusEditableNodeAndShowKeyboard() {
@@ skipping 57 matching lines @@
   // Simulate hide keyboard by pressing hide key on the virtual keyboard.
   keyboard::KeyboardController::GetInstance()->HideKeyboard(
       keyboard::KeyboardController::HIDE_REASON_MANUAL);
   EXPECT_FALSE(IsKeyboardVisible());
 
   MockEnableIMEInDifferentExtension("chrome-extension://domain-2");
   // Keyboard should not become visible if previous keyboard is not, even if it
   // is currently focused on an editable node.
   EXPECT_FALSE(IsKeyboardVisible());
 }