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

chrome/browser/ui/webui/signin/user_manager_ui_browsertest.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 "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/profiles/profile_window.h"
 #include "chrome/browser/profiles/profiles_state.h"
@@ skipping 14 matching lines @@
                                  public testing::WithParamInterface<bool> {
  public:
   UserManagerUIBrowserTest() {}
 
  protected:
   void SetUp() override {
     InProcessBrowserTest::SetUp();
     DCHECK(switches::IsNewAvatarMenu());
   }
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     switches::EnableNewAvatarMenuForTesting(command_line);
   }
 };
 
 IN_PROC_BROWSER_TEST_F(UserManagerUIBrowserTest, PageLoads) {
   ui_test_utils::NavigateToURL(
       browser(), GURL(chrome::kChromeUIUserManagerURL));
   content::WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
 
@@ skipping 37 matching lines @@
                          base::UTF16ToUTF8(profile_name).c_str());
   bool result = content::ExecuteScript(web_contents, launch_js);
   EXPECT_TRUE(result);
   base::RunLoop().RunUntilIdle();
 
   content::WebContents* about_chrome_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   GURL current_URL = about_chrome_contents->GetVisibleURL();
   EXPECT_EQ(GURL(chrome::kChromeUIUberURL), current_URL);
 }