Use PluginView type rather than FrameViewBase for v8 Script object.

third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp

 /*
  * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 164 matching lines @@
       m_windowProxyManager->mainWorldProxyMaybeUninitialized()
           ->contextIfInitialized();
   if (v8Context.IsEmpty())
     return;
   v8Context->AllowCodeGenerationFromStrings(false);
   v8Context->SetErrorMessageForCodeGenerationFromStrings(
       v8String(isolate(), errorMessage));
 }
 
 PassRefPtr<SharedPersistent<v8::Object>> ScriptController::createPluginWrapper(
-    FrameViewBase* frameViewBase) {
-  DCHECK(frameViewBase);
-
-  if (!frameViewBase->isPluginView())
-    return nullptr;
-
+    PluginView& plugin) {
   v8::HandleScope handleScope(isolate());
-  v8::Local<v8::Object> scriptableObject =
-      toPluginView(frameViewBase)->scriptableObject(isolate());
+  v8::Local<v8::Object> scriptableObject = plugin.scriptableObject(isolate());
 
   if (scriptableObject.IsEmpty())
     return nullptr;
 
   return SharedPersistent<v8::Object>::create(scriptableObject, isolate());
 }
 
 V8Extensions& ScriptController::registeredExtensions() {
   DEFINE_STATIC_LOCAL(V8Extensions, extensions, ());
   return extensions;
@@ skipping 160 matching lines @@
     for (size_t i = 0; i < resultArray->Length(); ++i) {
       v8::Local<v8::Value> value;
       if (!resultArray->Get(context, i).ToLocal(&value))
         return;
       results->push_back(value);
     }
   }
 }
 
 }  // namespace blink