Added check in page click tracker to ensure events passed in are mouse events...

chrome/renderer/page_click_tracker.cc

 // Copyright (c) 2010 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/renderer/page_click_tracker.h"
 
 #include "chrome/renderer/page_click_listener.h"
 #include "chrome/renderer/render_view.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebDocument.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebDOMMouseEvent.h"
@@ skipping 83 matching lines @@
   listeners_.AddObserver(listener);
 }
 
 void PageClickTracker::RemoveListener(PageClickListener* listener) {
   listeners_.RemoveObserver(listener);
 }
 
 void PageClickTracker::handleEvent(const WebDOMEvent& event) {
   last_node_clicked_.reset();
 
-  DCHECK(event.isMouseEvent());
+  if (!event.isMouseEvent())
+    return;
+
   const WebDOMMouseEvent mouse_event = event.toConst<WebDOMMouseEvent>();
   DCHECK(mouse_event.buttonDown());
   if (mouse_event.button() != 0)
     return;  // We are only interested in left clicks.
 
   // Remember which node has focus before the click is processed.
   // We'll get a notification once the mouse event has been processed
   // (DidHandleMouseEvent), we'll notify the listener at that point.
   last_node_clicked_ = mouse_event.target();
   was_focused_ = (GetFocusedNode() == last_node_clicked_);
 }
 
 WebNode PageClickTracker::GetFocusedNode() {
   WebView* web_view = render_view_->webview();
   if (!web_view)
     return WebNode();
 
   WebFrame* web_frame = web_view->focusedFrame();
   if (!web_frame)
     return WebNode();
 
   return web_frame->document().focusedNode();
 }