Remove IME API from Blink

Remove IME API from Blink

This removes all of the W3C IME API implementation
along with its tests.

The implementation has been under experimental flag for
a more than a year and we saw no increasing interest of
shipping this, so removing the code from repository for
code health.

We may readd the code or reimplement the API to the latest
spec in the future.

This is the second part of the 3-side patch.
fist one (Chromium side, landed):
https://codereview.chromium.org/1150953003/
last one (Chromium side):
https://codereview.chromium.org/1163603004/

BUG=494856
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196281

[kochi, 2015-06-01 05:36:07]

The CQ bit was checked by kochi@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-01 05:36:19]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162853002/1

[kochi, 2015-06-01 05:39:35]

The CQ bit was checked by kochi@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-01 05:39:39]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162853002/20001

[kochi, 2015-06-01 06:30:55]

The CQ bit was checked by kochi@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-01 06:31:05]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162853002/40001

[kochi, 2015-06-01 06:39:45]

kochi@chromium.org changed reviewers:
+ tkent@chromium.org

[commit-bot: I haz the power, 2015-06-01 09:29:40]

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

[commit-bot: I haz the power, 2015-06-01 09:29:41]

Dry run: This issue passed the CQ dry run.

[kochi, 2015-06-02 01:28:18]

The CQ bit was checked by kochi@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-02 01:28:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162853002/80001

[kochi, 2015-06-02 01:45:27]

Please review this.
Thanks.

[tkent, 2015-06-02 02:05:51]

lgtm

nit: you might want to remove 'IME' from Source/build/scripts/name_utilities.py.

[kochi, 2015-06-02 02:33:56]

Thanks for the review.

On 2015/06/02 02:05:51, tkent wrote:
> lgtm
> 
> nit: you might want to remove 'IME' from
Source/build/scripts/name_utilities.py.

Sounds okay, after this CL 'IME' seems only used in comments.
Will do in another CL.

[commit-bot: I haz the power, 2015-06-02 04:12:44]

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

[commit-bot: I haz the power, 2015-06-02 04:12:45]

Dry run: This issue passed the CQ dry run.

[kochi, 2015-06-02 04:15:42]

The CQ bit was checked by kochi@chromium.org

[commit-bot: I haz the power, 2015-06-02 04:16:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162853002/80001

[commit-bot: I haz the power, 2015-06-02 04:20:22]

Committed patchset #5 (id:80001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196281