Delete more probably unused plugin code.

third_party/WebKit/Source/web/WebPluginContainerImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 246 matching lines @@
         return;  // No change.
 
     Widget::setParentVisible(parentVisible);
     if (!isSelfVisible())
         return;  // This widget has explicitely been marked as not visible.
 
     if (m_webPlugin)
         m_webPlugin->updateVisibility(isVisible());
 }
 
-void WebPluginContainerImpl::setParent(Widget* widget)
-{
-    // We override this function so that if the plugin is windowed, we can call
-    // NPP_SetWindow at the first possible moment.  This ensures that
-    // NPP_SetWindow is called before the manual load data is sent to a plugin.
-    // If this order is reversed, Flash won't load videos.

[dcheng, 2016/06/24 22:57:26]

As far as I can tell, it works now? I tried vimeo, but if you have suggestions
for other Flash video sites, please let me know.

[esprehn, 2016/06/24 23:01:42]

Pepper flash doesn't supported the windowed mode I think.

[piman, 2016/06/25 01:07:01]

Right, Pepper is essentially a mix of windowed and windowless, taking the best
of both. Anyway, I'm pretty sure we made sure that Pepper Flash wasn't subject
to this sort of ordering constraints. NPP_SetWindow was pretty critical for a
bunch of things in NPAPI, but the equivalent (PPP_Instance.DidChangeView) is
only relevant for display.

-
-    Widget::setParent(widget);
-    if (widget)
-        reportGeometry();
-    else if (m_webPlugin)
-        m_webPlugin->containerDidDetachFromParent();
-}
-
 void WebPluginContainerImpl::setPlugin(WebPlugin* plugin)
 {
     if (plugin == m_webPlugin)
         return;
 
     m_element->resetInstance();
     m_webPlugin = plugin;
     m_isDisposed = false;
 }
 
@@ skipping 664 matching lines @@
         // frame view.
         computeClipRectsForPlugin(m_element, windowRect, clipRect, unobscuredRect);
     }
     getPluginOcclusions(m_element, this->parent(), frameRect(), cutOutRects);
     // Convert to the plugin position.
     for (size_t i = 0; i < cutOutRects.size(); i++)
         cutOutRects[i].move(-frameRect().x(), -frameRect().y());
 }
 
 } // namespace blink