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

chrome/browser/chrome_content_browser_client_browsertest.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 "base/command_line.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
@@ skipping 69 matching lines @@
   ASSERT_TRUE(entry != NULL);
   EXPECT_TRUE(entry->GetVirtualURL().is_valid());
   EXPECT_EQ(url, entry->GetVirtualURL());
 }
 
 // Test that a basic navigation works in --site-per-process mode.  This prevents
 // regressions when that mode calls out into the ChromeContentBrowserClient,
 // such as http://crbug.com/164223.
 IN_PROC_BROWSER_TEST_F(ChromeContentBrowserClientBrowserTest,
                        SitePerProcessNavigation) {
-  CommandLine::ForCurrentProcess()->AppendSwitch(
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kSitePerProcess);
   ASSERT_TRUE(test_server()->Start());
   const GURL url(test_server()->GetURL("files/title1.html"));
 
   ui_test_utils::NavigateToURL(browser(), url);
   NavigationEntry* entry = GetLastCommittedEntry();
 
   ASSERT_TRUE(entry != NULL);
   EXPECT_EQ(url, entry->GetURL());
   EXPECT_EQ(url, entry->GetVirtualURL());
 }
 
 }  // namespace content