Drop [LegacyInterfaceTypeChecking] where trivial in core/

third_party/WebKit/Source/core/clipboard/DataTransfer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 194 matching lines @@
         if (m_dataObject->item(i)->kind() == DataObjectItem::FileKind) {
             Blob* blob = m_dataObject->item(i)->getAsFile();
             if (blob && blob->isFile())
                 files->append(toFile(blob));
         }
     }
 
     return files;
 }
 
-void DataTransfer::setDragImage(Element* image, int x, int y, ExceptionState& exceptionState)
+void DataTransfer::setDragImage(Element* image, int x, int y)
 {
+    ASSERT(image);
+
     if (!isForDragAndDrop())
         return;
 
-    if (!image) {
-        exceptionState.throwTypeError("setDragImage: Invalid first argument");
-        return;
-    }
     IntPoint location(x, y);
     if (isHTMLImageElement(*image) && !image->inDocument())
         setDragImageResource(toHTMLImageElement(*image).cachedImage(), location);
     else
         setDragImageElement(image, location);
 }
 
 void DataTransfer::clearDragImage()
 {
     if (!canSetDragImage())
@@ skipping 281 matching lines @@
 
 DEFINE_TRACE(DataTransfer)
 {
     visitor->trace(m_dataObject);
 #if ENABLE(OILPAN)
     visitor->trace(m_dragImageElement);
 #endif
 }
 
 } // namespace blink