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

chrome/browser/ui/views/about_chrome_view.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/ui/views/about_chrome_view.h"
 
 #if defined(OS_WIN)
 #include <commdlg.h>
 #endif  // defined(OS_WIN)
 
@@ skipping 563 matching lines @@
   } else if (source == chromium_url_) {
     url = google_util::AppendGoogleLocaleParam(
       GURL(chrome::kChromiumProjectURL));
   } else if (source == open_source_url_) {
     url = GURL(chrome::kChromeUICreditsURL);
   } else {
     NOTREACHED() << "Unknown link source";
   }
 
   Browser* browser = BrowserList::GetLastActive();
-  browser->OpenURL(url, GURL(), NEW_WINDOW, PageTransition::LINK);
+  browser->OpenURL(url, GURL(), NEW_WINDOW, content::PAGE_TRANSITION_LINK);
 }
 
 #if defined(OS_WIN) && !defined(USE_AURA)
 ////////////////////////////////////////////////////////////////////////////////
 // AboutChromeView, GoogleUpdateStatusListener implementation:
 
 void AboutChromeView::OnReportResults(GoogleUpdateUpgradeResult result,
                                       GoogleUpdateErrorCode error_code,
                                       const string16& version) {
   // Drop the last reference to the object so that it gets cleaned up here.
@@ skipping 128 matching lines @@
   // We have updated controls on the parent, so we need to update its layout.
   parent()->Layout();
 
   // Check button may have appeared/disappeared. We cannot call this during
   // ViewHierarchyChanged because the view hasn't been added to a Widget yet.
   if (GetWidget())
     GetDialogClientView()->UpdateDialogButtons();
 }
 
 #endif