Only generate suggested filenames when actually dragging an image.

third_party/WebKit/Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * 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
@@ skipping 843 matching lines @@
   node->document().updateStyleAndLayoutTree();
   if (hasRichlyEditableStyle(*node)) {
     // TODO(editing-dev): We should use |EphemeralRange| instead of |Range|.
     Range* range = source->document()->createRange();
     range->selectNode(node, ASSERT_NO_EXCEPTION);
     source->selection().setSelection(
         SelectionInDOMTree::Builder()
             .setBaseAndExtent(EphemeralRange(range))
             .build());
   }
-  dataTransfer->declareAndWriteDragImage(
-      node, !linkURL.isEmpty() ? linkURL : imageURL, label);
+  dataTransfer->declareAndWriteDragImage(node, linkURL, imageURL, label);
 }
 
 bool DragController::populateDragDataTransfer(LocalFrame* src,
                                               const DragState& state,
                                               const IntPoint& dragOrigin) {
 #if DCHECK_IS_ON()
   DCHECK(dragTypeIsValid(state.m_dragType));
 #endif
   DCHECK(src);
   if (!src->view() || src->contentLayoutItem().isNull())
@@ skipping 355 matching lines @@
 }
 
 DEFINE_TRACE(DragController) {
   visitor->trace(m_page);
   visitor->trace(m_documentUnderMouse);
   visitor->trace(m_dragInitiator);
   visitor->trace(m_fileInputElementUnderMouse);
 }
 
 }  // namespace blink