fix typo missed in last commit

git-svn-id: http://src.chromium.org/svn/trunk/deps/reference_builds/chrome_mac@35423 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
diff --git a/notes.txt b/notes.txt
index 4c47b1e..942e2e6 100644
--- a/notes.txt
+++ b/notes.txt
@@ -39,7 +39,7 @@
 
 
 Once the build is done, remove the keystone framework and plist keys so when
-it is used by tests, it won't try to keep it self updated.
+it is used by tests, it won't try to keep itself updated.
 
         rm -rf \
           "Google Chrome.app/Contents/Versions/[new_version]/Google Chrome Framework.framework/Frameworks/KeystoneRegistration.framework"