Cleanup reference to old WebKit namespace

Cleanup reference to old WebKit namespace

I've also added the WTF namespace, which we still use.

R=erg@chromium.org

Committed: https://crrev.com/8db5ce7d2093e76ee784e41a95b94308eec672ce
Cr-Commit-Position: refs/heads/master@{#295190}

[Elliot Glaysher, 2014-09-15 19:44:03]

lgtm

[abarth-chromium, 2014-09-15 20:13:58]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-09-15 20:24:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/574473002/1

[commit-bot: I haz the power, 2014-09-15 22:48:50]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-15 22:48:51]

Exceeded time limit waiting for builds to trigger.

[abarth-chromium, 2014-09-17 00:22:20]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-09-17 00:24:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/574473002/1

[commit-bot: I haz the power, 2014-09-17 00:31:02]

Committed patchset #1 (id:1) as b0902d0da2d5e50e750b1ef8497e4df80e2986ff

[commit-bot: I haz the power, 2014-09-17 00:31:41]

Patchset 1 (id:??) landed as
https://crrev.com/8db5ce7d2093e76ee784e41a95b94308eec672ce
Cr-Commit-Position: refs/heads/master@{#295190}