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

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_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_bar_controller.h"
 
 #include "base/mac/mac_util.h"
 #include "base/metrics/histogram.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_editor.h"
@@ skipping 1093 matching lines @@
     }
   }
 
   // Enabled by default.
   return YES;
 }
 
 // Actually open the URL.  This is the last chance for a unit test to
 // override.
 - (void)openURL:(GURL)url disposition:(WindowOpenDisposition)disposition {
-  browser_->OpenURL(url, GURL(), disposition, PageTransition::AUTO_BOOKMARK);
+  browser_->OpenURL(
+      url, GURL(), disposition, content::PAGE_TRANSITION_AUTO_BOOKMARK);
 }
 
 - (void)clearMenuTagMap {
   seedId_ = 0;
   menuTagMap_.clear();
 }
 
 - (int)preferredHeight {
   DCHECK(![self isAnimationRunning]);
 
@@ skipping 1644 matching lines @@
 // to minimize touching the object passed in (likely a mock).
 - (void)setButtonContextMenu:(id)menu {
   buttonContextMenu_ = menu;
 }
 
 - (void)setIgnoreAnimations:(BOOL)ignore {
   ignoreAnimations_ = ignore;
 }
 
 @end