Start/stop WebKitThread from BrowserMainLoop like other BrowserThreads.

content/browser/in_process_webkit/webkit_thread.cc

 // Copyright (c) 2011 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 "content/browser/in_process_webkit/webkit_thread.h"
 
 #include "base/command_line.h"
 #include "content/browser/in_process_webkit/browser_webkitplatformsupport_impl.h"
 #include "content/public/common/content_switches.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebKit.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
 #include "webkit/glue/webkit_glue.h"
 
-using content::BrowserThread;
+namespace content {
 
 WebKitThread::WebKitThread() {
 }
 
 // This happens on the UI thread after the IO thread has been shut down.
 WebKitThread::~WebKitThread() {
   // We can't just check CurrentlyOn(BrowserThread::UI) because in unit tests,
   // MessageLoop::Current is sometimes NULL and other times valid and there's
   // no BrowserThread object.  Can't check that CurrentlyOn is not IO since
   // some unit tests set that BrowserThread for other checks.
@@ skipping 34 matching lines @@
   WebKit::WebSecurityOrigin::create(GURL("http://chromium.org"));
 
   // If possible, post initialization tasks to this thread (rather than doing
   // them now) so we don't block the UI thread any longer than we have to.
 }
 
 void WebKitThread::InternalWebKitThread::CleanUp() {
   DCHECK(webkit_platform_support_.get());
   WebKit::shutdown();
 }
+
+}  // namespace content