Improve comment added in r145396.

R=cmp@chromium.org
BUG=
TEST=


Review URL: https://chromiumcodereview.appspot.com/10736011

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@146136 0039d316-1c4b-4281-b951-d872f2087c98

gclient_utils.py

@@ -78,7 +78,8 @@ class PrintableObject(object):
 
 def FileRead(filename, mode='rU'):
   with open(filename, mode=mode) as f:
-    # codecs.open() has different behavior than open() on python 2.6.
+    # codecs.open() has different behavior than open() on python 2.6 so use
+    # open() and decode manually.
     return f.read().decode('utf-8')