Delete RenderWidgetHostViewChildFrame on Destroy().

content/browser/frame_host/render_widget_host_view_guest.cc

 // 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 "content/browser/frame_host/render_widget_host_view_guest.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
@@ skipping 221 matching lines @@
     int error_code) {
   // The |platform_view_| gets destroyed before we get here if this view
   // is for an InterstitialPage.
   if (platform_view_)
     platform_view_->RenderProcessGone(status, error_code);
 
   RenderWidgetHostViewChildFrame::RenderProcessGone(status, error_code);
 }
 
 void RenderWidgetHostViewGuest::Destroy() {
-  RenderWidgetHostViewChildFrame::Destroy();
-
   if (platform_view_)  // The platform view might have been destroyed already.
     platform_view_->Destroy();
+
+  // RenderWidgetHostViewChildFrame::Destroy destroys this object.
+  RenderWidgetHostViewChildFrame::Destroy();
 }
 
 gfx::Size RenderWidgetHostViewGuest::GetPhysicalBackingSize() const {
   // We obtain the reference to native view from the owner RenderWidgetHostView.
   // If the guest is embedded inside a cross-process frame, it is possible to
   // reach here after the frame is detached in which case there will be no owner
   // view.
   if (!GetOwnerRenderWidgetHostView())
     return gfx::Size();
   return RenderWidgetHostViewBase::GetPhysicalBackingSize();
@@ skipping 383 matching lines @@
         gesture_event.data.scrollUpdate.inertialPhase ==
             blink::WebGestureEvent::MomentumPhase) {
       return;
     }
     host_->ForwardGestureEvent(gesture_event);
     return;
   }
 }
 
 }  // namespace content