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

chrome/browser/history/history_notifications.h

 // Copyright (c) 2006-2008 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.
 
 // Structs that hold data used in broadcasting notifications.
 
 #ifndef CHROME_BROWSER_HISTORY_HISTORY_NOTIFICATIONS_H__
 #define CHROME_BROWSER_HISTORY_HISTORY_NOTIFICATIONS_H__
 #pragma once
 
@@ skipping 12 matching lines @@
 struct HistoryDetails {
  public:
   virtual ~HistoryDetails() {}
 };
 
 // Details for HISTORY_URL_VISITED.
 struct URLVisitedDetails : public HistoryDetails {
   URLVisitedDetails();
   virtual ~URLVisitedDetails();
 
-  PageTransition::Type transition;
+  content::PageTransition transition;
   URLRow row;
 
   // A list of redirects leading up to the URL represented by this struct. If
   // we have the redirect chain A -> B -> C and this struct represents visiting
   // C, then redirects[0]=B and redirects[1]=A.  If there are no redirects,
   // this will be an empty vector.
   history::RedirectList redirects;
 };
 
 // Details for NOTIFY_HISTORY_TYPED_URLS_MODIFIED.
@@ skipping 46 matching lines @@
   virtual ~KeywordSearchTermDetails();
 
   GURL url;
   TemplateURLID keyword_id;
   string16 term;
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_NOTIFICATIONS_H__