Adding "static_assert" in lieu of "COMPILE_ASSERT" in gin module

Adding "static_assert" in lieu of "COMPILE_ASSERT" in gin module

All our toolchains support c++'s static_assert now- COMPILE_ASSERT can be removed now.

BUG=442514
Committed: https://crrev.com/c1b6156b0820a71a933ffd5e9c28da396003dc2d
Cr-Commit-Position: refs/heads/master@{#312281}

[anujsharma, 2015-01-20 12:39:49]

anujk.sharma@samsung.com changed reviewers:
+ jochen@chromium.org

[anujsharma, 2015-01-20 12:39:49]

PTAL

[jochen (gone - plz use gerrit), 2015-01-20 19:19:33]

lgtm

[anujsharma, 2015-01-20 19:29:43]

On 2015/01/20 19:19:33, jochen (slow) wrote:
> lgtm

Thanks jochen for lgtm.

[anujsharma, 2015-01-20 19:30:02]

The CQ bit was checked by anujk.sharma@samsung.com

[commit-bot: I haz the power, 2015-01-20 19:31:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/855953007/1

[commit-bot: I haz the power, 2015-01-20 21:48:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-20 21:50:05]

Patchset 1 (id:??) landed as
https://crrev.com/c1b6156b0820a71a933ffd5e9c28da396003dc2d
Cr-Commit-Position: refs/heads/master@{#312281}