Remove candidate show/hide/update related code

Remove candidate show/hide/update related code

This is the second half of removing W3C IME API code
on Chromium side. The first half is:
https://codereview.chromium.org/1150953003/

OnCandidate* interface of TextInputClient is no longer
used by anyone once Blink removes IME API code.
ViewMsg_CandidateWindow* IPC messages are also no longer
necessary.

This CL depends on the change on Blink side
https://codereview.chromium.org/1162853002/
to be rolled to Chromium.

BUG=494856
Committed: https://crrev.com/32dbfae08fffc0677d56e56db9ebe2df7f632bf1
Cr-Commit-Position: refs/heads/master@{#332601}

[kochi, 2015-06-01 07:49:32]

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

[commit-bot: I haz the power, 2015-06-01 07:49:54]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1163603004/1

[commit-bot: I haz the power, 2015-06-01 08:11:16]

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

[commit-bot: I haz the power, 2015-06-01 08:11:18]

Dry run: Try jobs failed on following builders:
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[kochi, 2015-06-02 02:15:14]

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

[kochi, 2015-06-02 02:15:34]

Shiino-san,
Could you review this?

[Yuki, 2015-06-02 04:58:24]

lgtm

[kochi, 2015-06-02 05:30:11]

kochi@chromium.org changed reviewers:
+ avi@chromium.org, dcheng@chromium.org, sky@chromium.org

[kochi, 2015-06-02 05:30:11]

Avi, could you review content/* ?
Daniel, could you review content/common/view_messages.h?
Sky, could you review ui/views/* ?

[dcheng, 2015-06-02 05:36:03]

rs lgtm for deletions in view_messages.h

[kochi, 2015-06-02 07:53:10]

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

[commit-bot: I haz the power, 2015-06-02 07:53:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1163603004/20001

[commit-bot: I haz the power, 2015-06-02 09:04:45]

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

[commit-bot: I haz the power, 2015-06-02 09:04:46]

Dry run: This issue passed the CQ dry run.

[sky, 2015-06-02 16:13:37]

ui/views LGTM

[kochi, 2015-06-03 01:13:15]

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

[kochi, 2015-06-03 01:13:16]

Jochen, could you OWNERS review for content/* ?
(in case Avi is not available)

[jochen (gone - plz use gerrit), 2015-06-03 10:49:34]

lgtm

[kochi, 2015-06-03 11:07:27]

The CQ bit was checked by kochi@chromium.org

[commit-bot: I haz the power, 2015-06-03 11:07:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1163603004/20001

[commit-bot: I haz the power, 2015-06-03 12:22:37]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-03 12:23:28]

Patchset 2 (id:??) landed as
https://crrev.com/32dbfae08fffc0677d56e56db9ebe2df7f632bf1
Cr-Commit-Position: refs/heads/master@{#332601}