Fix a bug where ExtensionHost and ExtensionView weren't getting closed proper...

chrome/browser/extensions/extension_view.cc

 // Copyright (c) 2006-2009 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/browser/extensions/extension_view.h"
 
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/renderer_host/render_widget_host_view.h"
 #if defined(OS_WIN)
 #include "chrome/browser/renderer_host/render_widget_host_view_win.h"
 #endif
+#include "chrome/common/notification_service.h"
+#include "chrome/common/notification_type.h"
 #include "views/widget/widget.h"
 
 ExtensionView::ExtensionView(ExtensionHost* host, Browser* browser)
     : host_(host), browser_(browser),
       initialized_(false), pending_preferred_width_(0), container_(NULL) {
   host_->set_view(this);
+  registrar_.Add(this, NotificationType::BROWSER_CLOSED,
+                 Source<Browser>(browser_));
 }
 
 ExtensionView::~ExtensionView() {
   if (native_view())
     Detach();
 }
 
 Extension* ExtensionView::extension() const {
   return host_->extension();
 }
@@ skipping 84 matching lines @@
     host_->CreateRenderView(view);
     SetVisible(false);
 
     if (!pending_background_.empty()) {
       render_view_host()->view()->SetBackground(pending_background_);
       pending_background_.reset();
     }
   }
 }
 
+void ExtensionView::Observe(NotificationType type,
+                            const NotificationSource& source,
+                            const NotificationDetails& details) {
+  if (type == NotificationType::BROWSER_CLOSED) {
+    delete host_;  // which in turn deletes this
+  } else {
+    NOTREACHED();
+  }
+}
+
 void ExtensionView::HandleMouseEvent() {
   if (container_)
     container_->OnExtensionMouseEvent(this);
 }
 
 void ExtensionView::HandleMouseLeave() {
   if (container_)
     container_->OnExtensionMouseLeave(this);
 }