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

content/shell/tools/plugin/PluginTest.cpp

 // Copyright 2014 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.
 
 /*
  * Copyright (C) 2010 Apple 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:
@@ skipping 117 matching lines @@
   // NPERR_GENERIC_ERROR.
   return NPERR_GENERIC_ERROR;
 }
 
 NPError PluginTest::NPP_SetValue(NPNVariable, void* value) {
   return NPERR_GENERIC_ERROR;
 }
 
 // NPN functions.
 
-NPError PluginTest::NPN_GetURL(const char* url, const char* target) {
-  return browser->geturl(m_npp, url, target);
-}
-
-NPError PluginTest::NPN_GetURLNotify(const char* url,
-                                     const char* target,
-                                     void* notifyData) {
-  return browser->geturlnotify(m_npp, url, target, notifyData);
-}
-
 NPError PluginTest::NPN_GetValue(NPNVariable variable, void* value) {
   return browser->getvalue(m_npp, variable, value);
 }
 
 void PluginTest::NPN_InvalidateRect(NPRect* invalidRect) {
   browser->invalidaterect(m_npp, invalidRect);
 }
 
 bool PluginTest::NPN_Invoke(NPObject* npobj,
                             NPIdentifier methodName,
@@ skipping 108 matching lines @@
 
   createTestFunctions()[identifier] = createTestFunction;
 }
 
 std::map<std::string, PluginTest::CreateTestFunction>&
 PluginTest::createTestFunctions() {
   static std::map<std::string, CreateTestFunction> testFunctions;
 
   return testFunctions;
 }