Bug 413913 - fix for failure to catch chmod exceptions in ffprofile_win32

a=anodelman, r=rcampbell (Bustage fix for current tree redness)

testing/performance/talos/ffprofile_win32.py

@@ -45,7 +45,13 @@ def MakeDirectoryContentsWritable(dirname):
     dirname: Name of the directory to make contents writable.
   """
 
-  for (root, dirs, files) in os.walk(dirname):
-    os.chmod(root, 0777)
-    for filename in files:
-      os.chmod(os.path.join(root, filename), 0777)
+  try:
+    for (root, dirs, files) in os.walk(dirname):
+      os.chmod(root, 0777)
+      for filename in files:
+        try:
+          os.chmod(os.path.join(root, filename), 0777)
+        except OSError, (errno, strerror):
+          print 'WARNING: failed to os.chmod(%s): %s : %s' % (os.path.join(root, filename), errno, strerror)
+  except OSError, (errno, strerror):
+    print 'WARNING: failed to MakeDirectoryContentsWritable: %s : %s' % (errno, strerror)