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

chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.h"
 
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"  // IDC_BOOKMARK_MENU
 #import "chrome/browser/app_controller_mac.h"
@@ skipping 75 matching lines @@
 }
 
 // Open the URL of the given BookmarkNode in the current tab.
 - (void)openURLForNode:(const BookmarkNode*)node {
   Browser* browser = Browser::GetTabbedBrowser(bridge_->GetProfile(), true);
   if (!browser)
     browser = Browser::Create(bridge_->GetProfile());
   WindowOpenDisposition disposition =
       event_utils::WindowOpenDispositionFromNSEvent([NSApp currentEvent]);
   browser->OpenURL(node->url(), GURL(), disposition,
-                   PageTransition::AUTO_BOOKMARK);
+                   content::PAGE_TRANSITION_AUTO_BOOKMARK);
 }
 
 // Open sites under BookmarkNode with the specified disposition.
 - (void)openAll:(NSInteger)tag
     withDisposition:(WindowOpenDisposition)disposition {
   int identifier = tag;
 
   const BookmarkNode* node = [self nodeForIdentifier:identifier];
   DCHECK(node);
 
@@ skipping 35 matching lines @@
 
 - (IBAction)openAllBookmarksNewWindow:(id)sender {
   [self openAll:[sender tag] withDisposition:NEW_WINDOW];
 }
 
 - (IBAction)openAllBookmarksIncognitoWindow:(id)sender {
   [self openAll:[sender tag] withDisposition:OFF_THE_RECORD];
 }
 
 @end  // BookmarkMenuCocoaController