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

chrome/browser/ui/sync/one_click_signin_sync_starter_unittest.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 "chrome/browser/ui/sync/one_click_signin_sync_starter.h"
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 16 matching lines @@
   OneClickSigninSyncStarterTest()
       : sync_starter_(NULL),
         failed_count_(0),
         succeeded_count_(0) {}
 
   // ChromeRenderViewHostTestHarness:
   void SetUp() override {
     ChromeRenderViewHostTestHarness::SetUp();
 
     // Disable sync to simplify the creation of a OneClickSigninSyncStarter.
-    CommandLine::ForCurrentProcess()->AppendSwitch(switches::kDisableSync);
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kDisableSync);
 
     SigninManagerBase* signin_manager = static_cast<FakeSigninManager*>(
         SigninManagerFactory::GetForProfile(profile()));
 
     signin_manager->Initialize(NULL);
     signin_manager->SetAuthenticatedUsername(kTestingUsername);
   }
 
   void Callback(OneClickSigninSyncStarter::SyncSetupResult result) {
     if (result == OneClickSigninSyncStarter::SYNC_SETUP_SUCCESS)
@@ skipping 72 matching lines @@
 
   const GURL kTestURL = GURL("http://www.example.com");
   CreateSyncStarter(base::Bind(&OneClickSigninSyncStarterTest::Callback,
                                base::Unretained(this)),
                     kTestURL);
   sync_starter_->MergeSessionComplete(
       GoogleServiceAuthError(GoogleServiceAuthError::NONE));
   EXPECT_EQ(1, succeeded_count_);
   EXPECT_EQ(kTestURL, controller.GetPendingEntry()->GetURL());
 }