Plugin Placeholders: Factor out common BindWebFrame method into base class.

components/plugins/renderer/loadable_plugin_placeholder.cc

Index: components/plugins/renderer/loadable_plugin_placeholder.cc
diff --git a/components/plugins/renderer/loadable_plugin_placeholder.cc b/components/plugins/renderer/loadable_plugin_placeholder.cc
index 90c3f9ba7183580e8f0c07d6736c85feda4421e8..37e2bb6e6b60967e8f2768fe3e6c9eb301a1759e 100644
--- a/components/plugins/renderer/loadable_plugin_placeholder.cc
+++ b/components/plugins/renderer/loadable_plugin_placeholder.cc
@@ -16,13 +16,11 @@
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
-#include "gin/handle.h"
 #include "gin/object_template_builder.h"
 #include "third_party/WebKit/public/web/WebDOMMessageEvent.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
-#include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebPluginContainer.h"
 #include "third_party/WebKit/public/web/WebScriptSource.h"
@@ -111,18 +109,6 @@ void LoadablePluginPlaceholder::MarkPluginEssential(
 }
 #endif
 
-void LoadablePluginPlaceholder::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());
-}
-
 gin::ObjectTemplateBuilder LoadablePluginPlaceholder::GetObjectTemplateBuilder(
     v8::Isolate* isolate) {
   return gin::Wrappable<PluginPlaceholder>::GetObjectTemplateBuilder(isolate)