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

content/shell/tools/plugin/Tests/GetURLWithJavaScriptURLDestroyingPlugin.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) 2011 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:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
- * THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "PluginTest.h"
-
-using namespace std;
-
-// From NPP_New, call NPN_GetURL to evaluate JavaScript that destroys the plugin.
-
-class GetURLWithJavaScriptURLDestroyingPlugin : public PluginTest {
-public:
-    GetURLWithJavaScriptURLDestroyingPlugin(NPP npp, const string& identifier)
-        : PluginTest(npp, identifier)
-    {
-    }
-
-private:
- NPError NPP_New(NPMIMEType pluginType,
-                 uint16_t mode,
-                 int16_t argc,
-                 char* argn[],
-                 char* argv[],
-                 NPSavedData* saved) override {
-        NPN_GetURL("javascript:removePlugin()", 0);
-        return NPERR_NO_ERROR;
-    }
-};
-
-static PluginTest::Register<GetURLWithJavaScriptURLDestroyingPlugin> getURLWithJavaScriptURLDestroyingPlugin("get-url-with-javascript-url-destroying-plugin");