Remove mainthread overhang painting code

Source/web/ChromeClientImpl.cpp

Index: Source/web/ChromeClientImpl.cpp
diff --git a/Source/web/ChromeClientImpl.cpp b/Source/web/ChromeClientImpl.cpp
index 4c246f5403de3aa2194148d7f2ddf3e7952e2c16..b47a0c603ad6b2191718e9df1ba6be63a956af7a 100644
--- a/Source/web/ChromeClientImpl.cpp
+++ b/Source/web/ChromeClientImpl.cpp
@@ -665,15 +665,6 @@ String ChromeClientImpl::acceptLanguages()
     return m_webView->client()->acceptLanguages();
 }
 
-bool ChromeClientImpl::paintCustomOverhangArea(GraphicsContext* context, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect)
-{
-    LocalFrame* frame = m_webView->mainFrameImpl()->frame();
-    WebPluginContainerImpl* pluginContainer = WebLocalFrameImpl::pluginContainerFromFrame(frame);
-    if (pluginContainer)
-        return pluginContainer->paintCustomOverhangArea(context, horizontalOverhangArea, verticalOverhangArea, dirtyRect);
-    return false;
-}
-
 GraphicsLayerFactory* ChromeClientImpl::graphicsLayerFactory() const
 {
     return m_webView->graphicsLayerFactory();