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

chrome/browser/history/history_tab_helper.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/history/history_tab_helper.h"
 
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/render_messages.h"
@@ skipping 31 matching lines @@
 scoped_refptr<history::HistoryAddPageArgs>
 HistoryTabHelper::CreateHistoryAddPageArgs(
     const GURL& virtual_url,
     const content::LoadCommittedDetails& details,
     const ViewHostMsg_FrameNavigate_Params& params) {
   scoped_refptr<history::HistoryAddPageArgs> add_page_args(
       new history::HistoryAddPageArgs(
           params.url, base::Time::Now(), tab_contents(), params.page_id,
           params.referrer, params.redirects, params.transition,
           history::SOURCE_BROWSED, details.did_replace_entry));
-  if (PageTransition::IsMainFrame(params.transition) &&
+  if (content::PageTransitionIsMainFrame(params.transition) &&
       virtual_url != params.url) {
     // Hack on the "virtual" URL so that it will appear in history. For some
     // types of URLs, we will display a magic URL that is different from where
     // the page is actually navigated. We want the user to see in history what
     // they saw in the URL bar, so we add the virtual URL as a redirect.  This
     // only applies to the main frame, as the virtual URL doesn't apply to
     // sub-frames.
     add_page_args->url = virtual_url;
     if (!add_page_args->redirects.empty())
       add_page_args->redirects.back() = virtual_url;
@@ skipping 94 matching lines @@
 }
 
 HistoryService* HistoryTabHelper::GetHistoryService() {
   Profile* profile =
       Profile::FromBrowserContext(tab_contents()->browser_context());
   if (profile->IsOffTheRecord())
     return NULL;
 
   return profile->GetHistoryService(Profile::IMPLICIT_ACCESS);
 }