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

chrome_frame/test/win_event_receiver.cc

Index: chrome_frame/test/win_event_receiver.cc
===================================================================
--- chrome_frame/test/win_event_receiver.cc	(revision 107404)
+++ chrome_frame/test/win_event_receiver.cc	(working copy)
@@ -169,8 +169,8 @@
 std::string WindowWatchdog::GetWindowCaption(HWND hwnd) {
   std::string caption;
   int len = ::GetWindowTextLength(hwnd) + 1;
-  ::GetWindowTextA(hwnd, WriteInto(&caption, len), len);
-
+  if (len > 1)
+    ::GetWindowTextA(hwnd, WriteInto(&caption, len), len);
   return caption;
 }