Showing Task manager on the foreground window.

chrome/browser/ui/cocoa/browser_window_cocoa.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.
 
 #include "chrome/browser/ui/cocoa/browser_window_cocoa.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/sys_string_conversions.h"
@@ skipping 349 matching lines @@
 void BrowserWindowCocoa::ConfirmBrowserCloseWithPendingDownloads() {
   // Call InProgressDownloadResponse asynchronously to avoid a crash when the
   // browser window is closed here (http://crbug.com/44454).
   MessageLoop::current()->PostTask(
       FROM_HERE,
       confirm_close_factory_.NewRunnableMethod(
           &Browser::InProgressDownloadResponse,
           true));
 }
 
-void BrowserWindowCocoa::ShowHTMLDialog(HtmlDialogUIDelegate* delegate,
-                                        gfx::NativeWindow parent_window) {
+gfx::NativeWindow BrowserWindowCocoa::ShowHTMLDialog(
+    HtmlDialogUIDelegate* delegate,
+    gfx::NativeWindow parent_window) {
   [HtmlDialogWindowController showHtmlDialog:delegate
                                      profile:browser_->profile()];
+  return NULL;
 }
 
 void BrowserWindowCocoa::UserChangedTheme() {
   [controller_ userChangedTheme];
 }
 
 int BrowserWindowCocoa::GetExtraRenderViewHeight() const {
   // Currently this is only used on linux.
   return 0;
 }
@@ skipping 247 matching lines @@
 
 NSWindow* BrowserWindowCocoa::window() const {
   return [controller_ window];
 }
 
 void BrowserWindowCocoa::UpdateSidebarForContents(TabContents* tab_contents) {
   if (tab_contents == browser_->GetSelectedTabContents()) {
     [controller_ updateSidebarForContents:tab_contents];
   }
 }