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

chrome/browser/extensions/api/screenlock_private/screenlock_private_apitest.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/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/screenlock_private/screenlock_private_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
@@ skipping 18 matching lines @@
 }  // namespace
 
 class ScreenlockPrivateApiTest : public ExtensionApiTest,
                                  public content::NotificationObserver {
  public:
   ScreenlockPrivateApiTest() {}
 
   ~ScreenlockPrivateApiTest() override {}
 
   // ExtensionApiTest
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII(
         extensions::switches::kWhitelistedExtensionID, kTestExtensionId);
 
 #if !defined(OS_CHROMEOS)
     // New profile management needs to be on for non-ChromeOS lock.
     ::switches::EnableNewProfileManagementForTesting(command_line);
 #endif
   }
 
@@ skipping 45 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(ScreenlockPrivateApiTest, LockUnlock) {
   RunTest("screenlock_private/lock_unlock");
 }
 
 IN_PROC_BROWSER_TEST_F(ScreenlockPrivateApiTest, AuthType) {
   RunTest("screenlock_private/auth_type");
 }
 
 }  // namespace extensions