Revert middle click related changes

third_party/WebKit/Source/core/events/MouseEvent.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 276 matching lines @@
 
     ASSERT(!mouseEvent.target() || mouseEvent.target() != mouseEvent.relatedTarget());
 
     EventTarget* relatedTarget = mouseEvent.relatedTarget();
 
     DispatchEventResult dispatchResult = dispatcher.dispatch();
 
     if (mouseEvent.type() != EventTypeNames::click || mouseEvent.detail() != 2)
         return dispatchResult;
 
-    // Do not send dblclick event for non-primary button clicks.
-    if (mouseEvent.button() != MouseButton::LeftButton)
-        return dispatchResult;
-
     // Special case: If it's a double click event, we also send the dblclick event. This is not part
     // of the DOM specs, but is used for compatibility with the ondblclick="" attribute. This is treated
     // as a separate event in other DOM-compliant browsers like Firefox, and so we do the same.
     MouseEvent* doubleClickEvent = MouseEvent::create();
     doubleClickEvent->initMouseEventInternal(EventTypeNames::dblclick, mouseEvent.bubbles(), mouseEvent.cancelable(), mouseEvent.view(),
         mouseEvent.detail(), mouseEvent.screenX(), mouseEvent.screenY(), mouseEvent.clientX(), mouseEvent.clientY(),
         mouseEvent.modifiers(), mouseEvent.button(), relatedTarget, mouseEvent.sourceCapabilities(), mouseEvent.buttons());
 
     // Inherit the trusted status from the original event.
     doubleClickEvent->setTrusted(mouseEvent.isTrusted());
     if (mouseEvent.defaultHandled())
         doubleClickEvent->setDefaultHandled();
     DispatchEventResult doubleClickDispatchResult = EventDispatcher::dispatchEvent(dispatcher.node(), MouseEventDispatchMediator::create(doubleClickEvent));
     if (doubleClickDispatchResult != DispatchEventResult::NotCanceled)
         return doubleClickDispatchResult;
     return dispatchResult;
 }
 
 } // namespace blink