Typo police.

chrome/installer/mac/dirdiffer.sh

Index: chrome/installer/mac/dirdiffer.sh
diff --git a/chrome/installer/mac/dirdiffer.sh b/chrome/installer/mac/dirdiffer.sh
index 6c2957f986c6ad9de8b54e34df317eafc19c4d3f..6c9b3d17500a6a678c7cb3d15c10b7af44161780 100755
--- a/chrome/installer/mac/dirdiffer.sh
+++ b/chrome/installer/mac/dirdiffer.sh
@@ -1,6 +1,6 @@
 #!/bin/bash -p
 
-# Copyright (c) 2010 The Chromium Authors. All rights reserved.
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
@@ -63,7 +63,7 @@
 #   matches this pattern, dirdiffer will also ignore the directory's contents.
 # DIRDIFFER_NO_DIFF
 #   When an entry in new_dir matches this regular expression, it will not be
-#   represented in patch_dir by a $gbs file prepared by goobsdif. It will only
+#   represented in patch_dir by a $gbs file prepared by goobsdiff. It will only
 #   appear as a $bz2, $gz, or $raw file. Only files in new_dir, not
 #   directories,  will be matched against this regular expression.
 #
@@ -433,7 +433,7 @@ verify_patch_dir() {
 
 # shell_safe_path ensures that |path| is safe to pass to tools as a
 # command-line argument. If the first character in |path| is "-", "./" is
-# prepended to it. The possibily-modified |path| is output.
+# prepended to it. The possibly-modified |path| is output.
 shell_safe_path() {
   local path="${1}"
   if [[ "${path:0:1}" = "-" ]]; then