Make test262 README file revision independent.

test/test262/README

Index: test/test262/README
diff --git a/test/test262/README b/test/test262/README
index 8e963c8900bccb5381a982a9b3241e35b041fc22..e563e85dd419476e9d545e8fd04062a9a4bcfbb7 100644
--- a/test/test262/README
+++ b/test/test262/README
@@ -3,12 +3,12 @@ into the v8 test harness. The tests are checked out as a dependency from
 
   https://chromium.googlesource.com/external/github.com/tc39/test262
 
-at hash 26e6fd7 (2015/10/01 revision) as 'data' in this directory. They are
+at a revision specified in the DEPS file as 'data' in this directory. They are
 fetched with 'gclient sync'. To update to a newer version, please change the
 DEPS file.
 
 Using a newer version, e.g. 'deadbeef' may be possible but the tests are only
-known to pass (and indeed run) with that revision. Example:
+known to pass (and indeed run) with the DEPS revision. Example:
 
   cd data
   git fetch