Avoid trying to delete a non-existent file.

base/file_util_win.cc

Index: base/file_util_win.cc
diff --git a/base/file_util_win.cc b/base/file_util_win.cc
index adf6608f4e3f16e32238fb46c6b2ae2cbaa5fc04..dce906313a2b78343632b787fb9edad56b3755c9 100644
--- a/base/file_util_win.cc
+++ b/base/file_util_win.cc
@@ -68,6 +68,12 @@ bool DeleteFile(const FilePath& path, bool recursive) {
     // to SHFileOperation, which will do the right thing.
     if (::DeleteFile(path.value().c_str()) != 0)
       return true;
+
+    // If the file doesn't exist, then we are done. This is belt-and-suspenders
+    // for avoiding a SHFileOperation() call on a non-existent file. See
+    // http://crbug.com/368455.
+    if (!PathExists(path))
+      return true;
   }
 
   // SHFILEOPSTRUCT wants the path to be terminated with two NULLs,