Remove duplication of DieFileDie, and move it to proper location.

chrome/test/ui/ui_test.h

Index: chrome/test/ui/ui_test.h
diff --git a/chrome/test/ui/ui_test.h b/chrome/test/ui/ui_test.h
index 2ccff54fbd70dcea319e5db1c9079cb83e695941..1d4374d8f3584c5c7616f403b20e1181e1d4aa4d 100644
--- a/chrome/test/ui/ui_test.h
+++ b/chrome/test/ui/ui_test.h
@@ -64,14 +64,6 @@ class UITest : public testing::Test {
 
   // ********* Utility functions *********
 
-  // Tries to delete the specified file/directory returning true on
-  // success.  This differs from file_util::Delete in that it
-  // repeatedly invokes Delete until successful, or a timeout is
-  // reached.  (This retrying is to work around Windows file locks
-  // and shouldn't be necessary on POSIX, but it can't hurt.)
-  // Returns true on success.
-  bool DieFileDie(const FilePath& file, bool recurse);
-
   // Launches the browser and IPC testing server.
   void LaunchBrowserAndServer();