Only generate suggested filenames when actually dragging an image.

third_party/WebKit/Source/core/clipboard/DataObject.h

Index: third_party/WebKit/Source/core/clipboard/DataObject.h
diff --git a/third_party/WebKit/Source/core/clipboard/DataObject.h b/third_party/WebKit/Source/core/clipboard/DataObject.h
index 9cd3e3d3b7a36eb62c33448be6b67a3b4b51b951..bcb9b03bb328367cd09476816d4db47c83ada85b 100644
--- a/third_party/WebKit/Source/core/clipboard/DataObject.h
+++ b/third_party/WebKit/Source/core/clipboard/DataObject.h
@@ -103,7 +103,10 @@ class CORE_EXPORT DataObject : public GarbageCollectedFinalized<DataObject>,
   }
 
   // Used to handle files (images) being dragged out.
-  void addSharedBuffer(const String& name, PassRefPtr<SharedBuffer>);
+  void addSharedBuffer(PassRefPtr<SharedBuffer>,
+                       const KURL&,
+                       const String& filenameExtension,
+                       const AtomicString& contentDisposition);
 
   int modifiers() const { return m_modifiers; }
   void setModifiers(int modifiers) { m_modifiers = modifiers; }