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

chrome/browser/extensions/signin/gaia_auth_extension_loader.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/extensions/signin/gaia_auth_extension_loader.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 22 matching lines @@
   extensions::ExtensionSystem* extension_system =
       extensions::ExtensionSystem::Get(context);
   ExtensionService* extension_service = extension_system->extension_service();
   return extension_service->component_loader();
 }
 
 void LoadGaiaAuthExtension(BrowserContext* context) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   extensions::ComponentLoader* component_loader = GetComponentLoader(context);
-  const CommandLine* command_line = CommandLine::ForCurrentProcess();
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kAuthExtensionPath)) {
     base::FilePath auth_extension_path =
         command_line->GetSwitchValuePath(switches::kAuthExtensionPath);
     component_loader->Add(IDR_GAIA_AUTH_MANIFEST, auth_extension_path);
     return;
   }
 
   int manifest_resource_id = IDR_GAIA_AUTH_MANIFEST;
 
 #if defined(OS_CHROMEOS)
@@ skipping 65 matching lines @@
     BrowserContextKeyedAPIFactory<GaiaAuthExtensionLoader> > g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<GaiaAuthExtensionLoader>*
 GaiaAuthExtensionLoader::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 } // namespace extensions