Terminate plugins as well as runing onunload handlers during slow shutdown.

webkit/plugins/ppapi/ppapi_plugin_instance.h

 // 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.
 
 #ifndef WEBKIT_PLUGINS_PPAPI_PPAPI_PLUGIN_INSTANCE_H_
 #define WEBKIT_PLUGINS_PPAPI_PPAPI_PLUGIN_INSTANCE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 106 matching lines @@
 
   // Returns the PP_Instance uniquely identifying this instance. Guaranteed
   // nonzero.
   PP_Instance pp_instance() const { return pp_instance_; }
 
   ResourceCreationImpl& resource_creation() { return resource_creation_; }
 
   // Does some pre-destructor cleanup on the instance. This is necessary
   // because some cleanup depends on the plugin instance still existing (like
   // calling the plugin's DidDestroy function). This function is called from
-  // the WebPlugin implementation when WebKit is about to remove the plugin.
+  // the WebPlugin implementation when WebKit is about to remove the plugin,
+  // and may also be called directly by RenderViewImpl when a clean wekbit
+  // shutdown is being skipped.
   void Delete();
 
   // Paints the current backing store to the web page.
   void Paint(WebKit::WebCanvas* canvas,
              const gfx::Rect& plugin_rect,
              const gfx::Rect& paint_rect);
 
   // Schedules a paint of the page for the given region. The coordinates are
   // relative to the top-left of the plugin. This does nothing if the plugin
   // has not yet been positioned. You can supply an empty gfx::Rect() to
@@ skipping 504 matching lines @@
   // The Flash proxy is associated with the instance.
   PPB_Flash_Impl flash_impl_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginInstance);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPAPI_PLUGIN_INSTANCE_H_