Move plugin placeholder style to CSS, and allow it to bypass main world CSP.

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 78 matching lines @@
     v8::Isolate* isolate = toIsolate(frame);
     return !isolate->InContext() || BindingSecurity::shouldAllowAccessToFrame(isolate, frame);
 }
 
 ScriptController::ScriptController(LocalFrame* frame)
     : m_frame(frame)
     , m_sourceURL(0)
     , m_isolate(v8::Isolate::GetCurrent())
     , m_windowProxy(WindowProxy::create(frame, DOMWrapperWorld::mainWorld(), m_isolate))
     , m_windowScriptNPObject(0)
+    , m_bypassMainWorldCSP(false)
 {
 }
 
 ScriptController::~ScriptController()
 {
     // WindowProxy::clearForClose() must be invoked before destruction starts.
     ASSERT(!m_windowProxy->isContextInitialized());
 }
 
 void ScriptController::clearScriptObjects()
@@ skipping 124 matching lines @@
             m_isolatedWorlds.set(world.worldId(), isolatedWorldWindowProxy.release());
         }
     }
     if (!windowProxy->isContextInitialized() && windowProxy->initializeIfNeeded() && world.isMainWorld())
         m_frame->loader().dispatchDidClearWindowObjectInMainWorld();
     return windowProxy;
 }
 
 bool ScriptController::shouldBypassMainWorldCSP()
 {
+    if (m_bypassMainWorldCSP)
+        return true;
+
     v8::Handle<v8::Context> context = m_isolate->GetCurrentContext();
     if (context.IsEmpty() || !toDOMWindow(context))
         return false;
     DOMWrapperWorld& world = DOMWrapperWorld::current(m_isolate);
     return world.isIsolatedWorld() ? world.isolatedWorldHasContentSecurityPolicy() : false;
 }
 
 TextPosition ScriptController::eventHandlerPosition() const
 {
     ScriptableDocumentParser* parser = m_frame->document()->scriptableDocumentParser();
@@ skipping 380 matching lines @@
         resultArray->Set(i, evaluationResult);
     }
 
     if (results) {
         for (size_t i = 0; i < resultArray->Length(); ++i)
             results->append(handleScope.Escape(resultArray->Get(i)));
     }
 }
 
 } // namespace blink