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

chrome/browser/translate/options_menu_model.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/translate/options_menu_model.h"
 
 #include "base/metrics/histogram.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/infobars/infobar_tab_helper.h"
@@ skipping 122 matching lines @@
       translate_infobar_delegate_->ReportLanguageDetectionError();
       break;
 
     case IDC_TRANSLATE_OPTIONS_ABOUT: {
       TabContents* tab_contents =
           translate_infobar_delegate_->owner()->tab_contents();
       if (tab_contents) {
         GURL about_url = google_util::AppendGoogleLocaleParam(
             GURL(kAboutGoogleTranslateUrl));
         tab_contents->OpenURL(
-            about_url, GURL(), NEW_FOREGROUND_TAB, PageTransition::LINK);
+            about_url, GURL(), NEW_FOREGROUND_TAB,
+            content::PAGE_TRANSITION_LINK);
       }
       break;
     }
 
     default:
       NOTREACHED() << "Invalid command id from menu.";
       break;
   }
 }