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

chrome/browser/chromeos/accessibility/magnification_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 <string>
 
 #include "ash/magnifier/magnification_controller.h"
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
@@ skipping 78 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MagnifierAnimationWaiter);
 };
 
 }  // namespace
 
 class MagnificationControllerTest : public InProcessBrowserTest {
  protected:
   MagnificationControllerTest() {}
   ~MagnificationControllerTest() override {}
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     InProcessBrowserTest::SetUpCommandLine(command_line);
     // Make screens sufficiently wide to host 2 browsers side by side.
     command_line->AppendSwitchASCII("ash-host-window-bounds", "1200x800");
   }
 
   void SetUpOnMainThread() override {
     SetMagnifierEnabled(true);
 
     // Confirms that magnifier is enabled.
     EXPECT_TRUE(IsMagnifierEnabled());
@@ skipping 110 matching lines @@
   // Set the focus on the button.
   SetFocusOnElement("test_button");
 
   // Verify the magnifier window is not moved and still contains the button.
   const gfx::Rect view_port_after_focus = GetViewPort();
   EXPECT_TRUE(view_port_after_focus.Contains(button_bounds));
   EXPECT_EQ(view_port_before_focus, view_port_after_focus);
 }
 
 }  // namespace chromeos