Remove third_party/web-animations-js from .gitignore

Remove third_party/web-animations-js from .gitignore

It's also part of src.git but told to be ignored by source code

R=dzhioev@chromium.org
BUG=none
TEST=none

Committed: https://crrev.com/2404dabfd66c1317e9ecf1f0678882143e39afd4
Cr-Commit-Position: refs/heads/master@{#341225}

[Dan Beam, 2015-07-30 23:29:29]

dbeam@chromium.org changed reviewers:
+ dzhioev@chromium.org
- dzhieov@chromium.org

[dzhioev (left Google), 2015-07-30 23:31:05]

On 2015/07/30 23:29:39, Dan Beam wrote:

LGTM

[Dan Beam, 2015-07-30 23:31:52]

The CQ bit was checked by dbeam@chromium.org

[commit-bot: I haz the power, 2015-07-30 23:32:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1264943002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1264943002/1

[commit-bot: I haz the power, 2015-07-30 23:41:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-30 23:42:04]

Patchset 1 (id:??) landed as
https://crrev.com/2404dabfd66c1317e9ecf1f0678882143e39afd4
Cr-Commit-Position: refs/heads/master@{#341225}