Only allow to lock the mouse when the tab is in fullscreen mode.

content/browser/tab_contents/tab_contents_delegate.cc

 // 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 "content/browser/tab_contents/tab_contents_delegate.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "content/browser/javascript_dialogs.h"
@@ skipping 276 matching lines @@
 }
 
 void TabContentsDelegate::EnumerateDirectory(TabContents* tab, int request_id,
                                              const FilePath& path) {
 }
 
 void TabContentsDelegate::ToggleFullscreenModeForTab(TabContents* tab,
                                                      bool enter_fullscreen) {
 }
 
+bool TabContentsDelegate::IsFullscreenForTab(const TabContents* tab) const {
+  return false;
+}
+
 void TabContentsDelegate::JSOutOfMemory(TabContents* tab) {
 }
 
 void TabContentsDelegate::RegisterProtocolHandler(TabContents* tab,
                                                   const std::string& protocol,
                                                   const GURL& url,
                                                   const string16& title) {
 }
 
 void TabContentsDelegate::RegisterIntentHandler(TabContents* tab,
@@ skipping 36 matching lines @@
 
 void TabContentsDelegate::Attach(TabContents* tab_contents) {
   DCHECK(attached_contents_.find(tab_contents) == attached_contents_.end());
   attached_contents_.insert(tab_contents);
 }
 
 void TabContentsDelegate::Detach(TabContents* tab_contents) {
   DCHECK(attached_contents_.find(tab_contents) != attached_contents_.end());
   attached_contents_.erase(tab_contents);
 }