Don't populate WebDropData with file URLs when dragging files.

app/clipboard/clipboard_util_win.h

Index: app/clipboard/clipboard_util_win.h
diff --git a/app/clipboard/clipboard_util_win.h b/app/clipboard/clipboard_util_win.h
index 5bbe8f00f44d0b521a1614f7dbdde7665582ca1a..7bedb51f2dccbeb6622a095bddba8b7e2938697a 100644
--- a/app/clipboard/clipboard_util_win.h
+++ b/app/clipboard/clipboard_util_win.h
@@ -44,7 +44,7 @@ class ClipboardUtil {
   // Helper methods to extract information from an IDataObject.  These methods
   // return true if the requested data type is found in |data_object|.
   static bool GetUrl(IDataObject* data_object,
-      std::wstring* url, std::wstring* title);
+      std::wstring* url, std::wstring* title, bool convert_filenames);
   static bool GetFilenames(IDataObject* data_object,
                            std::vector<std::wstring>* filenames);
   static bool GetPlainText(IDataObject* data_object, std::wstring* plain_text);