Make string_util::WriteInto() DCHECK() that the supplied |length_with_null| > 1, meaning that the...

ui/base/clipboard/clipboard_win.cc

Index: ui/base/clipboard/clipboard_win.cc
===================================================================
--- ui/base/clipboard/clipboard_win.cc	(revision 107404)
+++ ui/base/clipboard/clipboard_win.cc	(working copy)
@@ -599,7 +599,8 @@
 
   if (count) {
     for (int i = 0; i < count; ++i) {
-      int size = ::DragQueryFile(drop, i, NULL, 0) + 1;
+      UINT size = ::DragQueryFile(drop, i, NULL, 0) + 1;
+      DCHECK_GT(size, 1u);
       std::wstring file;
       ::DragQueryFile(drop, i, WriteInto(&file, size), size);
       files->push_back(FilePath(file));