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

chrome/browser/ui/cocoa/browser_window_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/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 1727 matching lines @@
 // Handle the openLearnMoreAboutCrashLink: action from SadTabController when
 // "Learn more" link in "Aw snap" page (i.e. crash page or sad tab) is
 // clicked. Decoupling the action from its target makes unitestting possible.
 - (void)openLearnMoreAboutCrashLink:(id)sender {
   if ([sender isKindOfClass:[SadTabController class]]) {
     SadTabController* sad_tab = static_cast<SadTabController*>(sender);
     TabContents* tab_contents = [sad_tab tabContents];
     if (tab_contents) {
       GURL helpUrl =
           google_util::AppendGoogleLocaleParam(GURL(chrome::kCrashReasonURL));
-      tab_contents->OpenURL(helpUrl, GURL(), CURRENT_TAB, PageTransition::LINK);
+      tab_contents->OpenURL(
+          helpUrl, GURL(), CURRENT_TAB, content::PAGE_TRANSITION_LINK);
     }
   }
 }
 
 // Delegate method called when window did move. (See below for why we don't use
 // |-windowWillMove:|, which is called less frequently than |-windowDidMove|
 // instead.)
 - (void)windowDidMove:(NSNotification*)notification {
   [self saveWindowPositionIfNeeded];
 
@@ skipping 374 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)