Remove PluginLoadObserver and related logic, it was only used for NPAPI.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1909 matching lines @@
 void WebLocalFrameImpl::didFail(const ResourceError& error, bool wasProvisional, HistoryCommitType commitType)
 {
     if (!client())
         return;
     WebURLError webError = error;
     WebHistoryCommitType webCommitType = static_cast<WebHistoryCommitType>(commitType);
     if (wasProvisional)
         client()->didFailProvisionalLoad(this, webError, webCommitType);
     else
         client()->didFailLoad(this, webError, webCommitType);
+    if (WebPluginContainerImpl* plugin = pluginContainerFromFrame(frame()))
+        plugin->didFailLoading(error);
+}
+
+void WebLocalFrameImpl::didFinish()
+{
+    if (!client())
+        return;
+    client()->didFinishLoad(this);
+    if (WebPluginContainerImpl* plugin = pluginContainerFromFrame(frame()))
+        plugin->didFinishLoading();
 }
 
 void WebLocalFrameImpl::setCanHaveScrollbars(bool canHaveScrollbars)
 {
     frame()->view()->setCanHaveScrollbars(canHaveScrollbars);
 }
 
 void WebLocalFrameImpl::setInputEventsTransformForEmulation(const IntSize& offset, float contentScaleFactor)
 {
     m_inputEventsOffsetForEmulation = offset;
@@ skipping 272 matching lines @@
 }
 
 WebSandboxFlags WebLocalFrameImpl::effectiveSandboxFlags() const
 {
     if (!frame())
         return WebSandboxFlags::None;
     return static_cast<WebSandboxFlags>(frame()->loader().effectiveSandboxFlags());
 }
 
 } // namespace blink