Fix RemoteFrame detachment to signal its client.

Source/web/RemoteFrameClientImpl.cpp

 // Copyright 2014 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 "config.h"
 #include "web/RemoteFrameClientImpl.h"
 
 #include "core/events/KeyboardEvent.h"
 #include "core/events/MouseEvent.h"
 #include "core/events/WheelEvent.h"
 #include "core/frame/RemoteFrame.h"
 #include "core/frame/RemoteFrameView.h"
 #include "core/rendering/RenderPart.h"
 #include "platform/exported/WrappedResourceRequest.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "platform/weborigin/SecurityPolicy.h"
+#include "public/web/WebRemoteFrameClient.h"
 #include "web/WebInputEventConversion.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebRemoteFrameImpl.h"
 
 namespace blink {
 
 RemoteFrameClientImpl::RemoteFrameClientImpl(WebRemoteFrameImpl* webFrame)
     : m_webFrame(webFrame)
 {
 }
 
 void RemoteFrameClientImpl::detached()
 {
-    // FIXME: Implement.
+    // Alert the client that the frame is being detached.
+    RefPtrWillBeRawPtr<WebRemoteFrameImpl> protector(m_webFrame);
+
+    WebRemoteFrameClient* client = m_webFrame->client();
+    if (!client)
+        return;
+
+    client->frameDetached();
+    // Clear our reference to RemoteFrame at the very end, in case the client
+    // refers to it.
+    m_webFrame->setCoreFrame(nullptr);
 }
 
 Frame* RemoteFrameClientImpl::opener() const
 {
     return toCoreFrame(m_webFrame->opener());
 }
 
 void RemoteFrameClientImpl::setOpener(Frame*)
 {
     // FIXME: Implement.
@@ skipping 59 matching lines @@
         webEvent = adoptPtr(new WebMouseWheelEventBuilder(m_webFrame->frame()->view(), toCoreFrame(m_webFrame)->ownerRenderer(), *static_cast<WheelEvent*>(event)));
 
     // Other or internal Blink events should not be forwarded.
     if (!webEvent || webEvent->type == WebInputEvent::Undefined)
         return;
 
     m_webFrame->client()->forwardInputEvent(webEvent.get());
 }
 
 } // namespace blink