Mac: make save/open dialogs operate as tab-modal sheets....

chrome/browser/cocoa/history_menu_cocoa_controller.mm

 // Copyright (c) 2009 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/app/chrome_dll_resource.h"  // IDC_HISTORY_MENU
+#include "chrome/app/chrome_dll_resource.h"  // IDC_*
 #include "chrome/browser/browser.h"
 #import "chrome/browser/cocoa/history_menu_cocoa_controller.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/cocoa/event_utils.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "webkit/glue/window_open_disposition.h"
 
@@ skipping 36 matching lines @@
   return (*results)[index];
 }
 
 - (IBAction)openHistoryMenuItem:(id)sender {
   NSInteger tag = [sender tag];
   HistoryMenuBridge::HistoryItem item = [self itemForTag:tag];
   DCHECK(item.url.is_valid());
   [self openURLForItem:item];
 }
 
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item {
+  if (Browser* browser = BrowserList::GetLastActive()) {
+    return browser->command_updater()->IsCommandEnabled(
+                                          IDC_HISTORY_MENU_CONTENTS) ? YES : NO;
+  }
+  // Enable history items when there's no browser window.
+  return YES;
+}
+
 @end  // HistoryMenuCocoaController