Remove NPAPI test plugin

content/shell/tools/plugin/Tests/LeakWindowScriptableObject.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.
-
-#include <stdint.h>
-
-#include "PluginTest.h"
-
-using namespace std;
-
-class LeakWindowScriptableObject : public PluginTest {
-public:
-    LeakWindowScriptableObject(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 {
-        // Get a new reference to the window script object.
-        NPObject* window;
-        if (NPN_GetValue(NPNVWindowNPObject, &window) != NPERR_NO_ERROR) {
-            log("Fail: Cannot fetch window script object");
-            return NPERR_NO_ERROR;
-        }
-
-        // Get another reference to the same object via window.self.
-        NPIdentifier self_name = NPN_GetStringIdentifier("self");
-        NPVariant window_self_variant;
-        if (!NPN_GetProperty(window, self_name, &window_self_variant)) {
-            log("Fail: Cannot query window.self");
-            return NPERR_NO_ERROR;
-        }
-        if (!NPVARIANT_IS_OBJECT(window_self_variant)) {
-            log("Fail: window.self is not an object");
-            return NPERR_NO_ERROR;
-        }
-
-        // Leak both references to the window script object.
-        return NPERR_NO_ERROR;
-    }
-};
-
-static PluginTest::Register<LeakWindowScriptableObject> leakWindowScriptableObject("leak-window-scriptable-object");