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

chrome/browser/extensions/api/push_messaging/push_messaging_apitest.cc

 // Copyright (c) 2012 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/api/push_messaging/push_messaging_api.h"
 
 #include "apps/launcher.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/extensions/api/push_messaging/push_messaging_invalidation_handler.h"
 #include "chrome/browser/extensions/api/push_messaging/push_messaging_invalidation_mapper.h"
@@ skipping 55 matching lines @@
 MockInvalidationMapper::~MockInvalidationMapper() {}
 
 }  // namespace
 
 class PushMessagingApiTest : public ExtensionApiTest {
  public:
   PushMessagingApiTest()
       : fake_invalidation_service_(NULL) {
   }
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
   }
 
   void SetUp() override {
     invalidation::ProfileInvalidationProviderFactory::GetInstance()->
         RegisterTestingFactory(BuildFakeProfileInvalidationProvider);
     ExtensionApiTest::SetUp();
   }
 
   void SetUpOnMainThread() override {
@@ skipping 114 matching lines @@
   const extensions::Extension* extension =
       LoadExtension(test_data_dir_.AppendASCII("push_messaging"));
   ASSERT_TRUE(extension);
   ui_test_utils::NavigateToURL(
       browser(), extension->GetResourceURL("get_channel_id.html"));
 
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
 }  // namespace extensions