Make sure WindowObservers are removed from window before destruction

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

 // Copyright (c) 2012 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/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/basictypes.h"
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 83 matching lines @@
       window_->RemoveObserver(this);
   }
 
   bool destroyed() const { return destroyed_; }
 
   // aura::WindowObserver overrides:
   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE {
     CHECK_EQ(window, window_);
     destroyed_ = true;
     window_ = NULL;
+    aura::WindowObserver::OnWindowDestroyed(window);
   }
 
  private:
   // Window that we're observing, or NULL if it's been destroyed.
   aura::Window* window_;
 
   // Was |window_| destroyed?
   bool destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWindowObserver);
@@ skipping 960 matching lines @@
   views[0]->WasHidden();
   EXPECT_FALSE(views[0]->frame_provider_);
 
   for (size_t i = 0; i < renderer_count; ++i) {
     views[i]->Destroy();
     delete hosts[i];
   }
 }
 
 }  // namespace content