Update V8_MERGE_REVISION

We return to the Chromium 9.0.597.x release branch now that
it has merged V8 2.5.9.9.

http://src.chromium.org/svn/releases/9.0.597.69/DEPS

Change-Id: I36a6173c9a03406cf0f275fd377f741555f6b620
1 file changed