Move PageTransition into content namespace. While I'm touching all these files, I've also updated...

chrome/browser/tabs/default_tab_handler.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 "chrome/browser/tabs/default_tab_handler.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/browser.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 // DefaultTabHandler, public:
@@ skipping 42 matching lines @@
 }
 
 int DefaultTabHandler::GetDragActions() const {
   return delegate_->AsBrowser()->GetDragActions();
 }
 
 TabContentsWrapper* DefaultTabHandler::CreateTabContentsForURL(
     const GURL& url,
     const GURL& referrer,
     Profile* profile,
-    PageTransition::Type transition,
+    content::PageTransition transition,
     bool defer_load,
     SiteInstance* instance) const {
   return delegate_->AsBrowser()->CreateTabContentsForURL(url,
                                                          referrer,
                                                          profile,
                                                          transition,
                                                          defer_load,
                                                          instance);
 }
 
@@ skipping 102 matching lines @@
   delegate_->AsBrowser()->TabStripEmpty();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // TabHandler, public:
 
 // static
 TabHandler* TabHandler::CreateTabHandler(TabHandlerDelegate* delegate) {
   return new DefaultTabHandler(delegate);
 }