Remove MockWebSpeechInputController

Remove MockWebSpeechInputController

It was used to run the x-webkit-speech layout tests, which
have been removed.

This depends on Blink r173128.

BUG=223198
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=267942

[hans, 2014-05-01 21:18:45]

tommi: please take a look
dmazzoni: please take an owner's look

This depends on https://codereview.chromium.org/264973003/

[tommi (sloooow) - chröme, 2014-05-01 21:21:21]

lgtm

[dmazzoni, 2014-05-01 21:48:33]

lgtm

[hans, 2014-05-02 16:57:09]

The layout tests were removed in Blink r173128, which was rolled in Chromium in
r267766.

[hans, 2014-05-02 16:57:29]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2014-05-02 16:57:49]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hans@chromium.org/268723002/1

[commit-bot: I haz the power, 2014-05-02 17:34:33]

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

[commit-bot: I haz the power, 2014-05-02 17:34:34]

Try jobs failed on following builders:
  mac_chromium_rel on tryserver.chromium

[hans, 2014-05-02 18:46:04]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2014-05-02 18:46:21]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hans@chromium.org/268723002/1

[commit-bot: I haz the power, 2014-05-02 20:31:25]

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

[commit-bot: I haz the power, 2014-05-02 20:31:26]

Try jobs failed on following builders:
  win_chromium_rel on tryserver.chromium

[hans, 2014-05-02 22:12:23]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2014-05-02 22:12:52]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hans@chromium.org/268723002/1

[commit-bot: I haz the power, 2014-05-02 22:18:27]

Change committed as 267942