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

chrome/browser/ui/window_sizer/window_sizer_ash_uitest.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 "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shell.h"
 #include "ash/test/shelf_test_api.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/test/ui_controls.h"
 #include "ui/events/test/event_generator.h"
 #include "ui/views/controls/menu/menu_controller.h"
 #include "ui/views/view.h"
 #include "ui/views/view_model.h"
 
 namespace {
 
 class WindowSizerTest : public InProcessBrowserTest {
  public:
   WindowSizerTest() {}
   ~WindowSizerTest() 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",
                                     "600x600,601+0-600x600");
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WindowSizerTest);
 };
 
@@ skipping 150 matching lines @@
 
   // Next new browser must be created on 1st display.
   ASSERT_EQ(2u, browser_list->size());
   EXPECT_EQ(root_windows[0],
             browser_list->get(1)->window()->GetNativeWindow()->GetRootWindow());
   EXPECT_EQ(root_windows[0], ash::Shell::GetTargetRootWindow());
 
   // Balanced with the chrome::IncrementKeepAliveCount above.
   chrome::DecrementKeepAliveCount();
 }