Reland: Plugin Placeholders: Refactor for platforms that don't support plugins

content/shell/renderer/layout_test/test_plugin_placeholder.cc

-// Copyright 2015 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 "content/shell/renderer/layout_test/test_plugin_placeholder.h"
-
-#include "gin/handle.h"
-#include "third_party/WebKit/public/web/WebKit.h"
-
-namespace content {
-
-TestPluginPlaceholder::TestPluginPlaceholder(
-    RenderFrame* render_frame,
-    blink::WebLocalFrame* frame,
-    const blink::WebPluginParams& params)
-    : PluginPlaceholder(render_frame,
-                        frame,
-                        params,
-                        "<div>Test content</div>",
-                        GURL("http://www.test.com")) {
-}
-
-void TestPluginPlaceholder::BindWebFrame(blink::WebFrame* frame) {
-  v8::Isolate* isolate = blink::mainThreadIsolate();
-  v8::HandleScope handle_scope(isolate);
-  v8::Local<v8::Context> context = frame->mainWorldScriptContext();
-  DCHECK(!context.IsEmpty());
-
-  v8::Context::Scope context_scope(context);
-  v8::Local<v8::Object> global = context->Global();
-  global->Set(gin::StringToV8(isolate, "plugin"),
-              gin::CreateHandle(isolate, this).ToV8());
-}
-
-}  // namespace content