added CTRL+Click and SHIFT+Click handler for context menu, Back and Forward.

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/memory/singleton.h"
 #include "content/browser/javascript_dialogs.h"
 #include "content/common/url_constants.h"
 #include "ui/gfx/rect.h"
 
+void TabContentsDelegate::GoBack(WindowOpenDisposition disposition) {
+}
+
+void TabContentsDelegate::GoForward(WindowOpenDisposition disposition) {
+}
+
 std::string TabContentsDelegate::GetNavigationHeaders(const GURL& url) {
   return std::string();
 }
 
 void TabContentsDelegate::LoadProgressChanged(double progress) {
 }
 
 void TabContentsDelegate::DetachContents(TabContents* source) {
 }
 
@@ skipping 213 matching lines @@
 TabContentsDelegate::GetJavaScriptDialogCreator() {
   return JavaScriptDialogCreatorStub::GetInstance();
 }
 
 void TabContentsDelegate::RenderViewCreated(TabContents* source,
                                             RenderViewHost* host) {
 }
 
 TabContentsDelegate::~TabContentsDelegate() {
 }