Use the latest hash with a commit position as webkit version

Use the latest hash with a commit position as webkit version

This will guarantee that a development build with a not yet commit HEAD
will also get a valid devtools frontend from the servers

BUG=535268
R=pfeldman@chromium.org,mnaganov@chromium.org,dpranke@chromium.org

Committed: https://crrev.com/fb61e3682fe7301373360fa851c7cb3dea9aec1f
Cr-Commit-Position: refs/heads/master@{#350565}

[mnaganov (inactive), 2015-09-24 15:33:59]

That's exactly what I intended to do, thanks! LGTM.

[jochen (gone - plz use gerrit), 2015-09-24 15:46:40]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2015-09-24 15:46:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1361393002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1361393002/1

[commit-bot: I haz the power, 2015-09-24 15:52:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-24 15:54:33]

Patchset 1 (id:??) landed as
https://crrev.com/fb61e3682fe7301373360fa851c7cb3dea9aec1f
Cr-Commit-Position: refs/heads/master@{#350565}

[Dirk Pranke, 2015-09-24 18:30:04]

lgtm