Make VoiceSearchTabHelper a purely native object

Make VoiceSearchTabHelper a purely native object

There's no reason for VoiceSearchTabHelper to exist as a Java entity. It
simply routes a WebContentsObserver callback originating in native
code back to some more native code for processing, and has no Java
dependencies.

Committed: https://crrev.com/fe9592fc2e2bcfb64ecb22eb2dbcee139a6797e6
Cr-Commit-Position: refs/heads/master@{#319186}

[jdduke (slow), 2015-03-04 20:01:26]

jdduke@chromium.org changed reviewers:
+ dtrainor@chromium.org

[jdduke (slow), 2015-03-04 20:01:27]

dtrainor@: Thoughts?

[David Trainor- moved to gerrit, 2015-03-04 23:13:22]

lgtm

[jdduke (slow), 2015-03-04 23:14:56]

jdduke@chromium.org changed reviewers:
+ pkasting@chromium.org

[jdduke (slow), 2015-03-04 23:14:57]

+pkasting for chrome/browser/ui review.

[Peter Kasting, 2015-03-04 23:20:35]

LGTM; feel free to TBR this sort of purely-mechanical change

[jdduke (slow), 2015-03-04 23:24:30]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2015-03-04 23:25:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/979813004/40001

[commit-bot: I haz the power, 2015-03-04 23:46:01]

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

[commit-bot: I haz the power, 2015-03-04 23:46:02]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[jdduke (slow), 2015-03-05 00:13:55]

The CQ bit was checked by jdduke@chromium.org

[jdduke (slow), 2015-03-05 00:13:55]

The patchset sent to the CQ was uploaded after l-g-t-m from
dtrainor@chromium.org, pkasting@chromium.org
Link to the patchset: https://codereview.chromium.org/979813004/#ps60001 (title:
"Rebase")

[commit-bot: I haz the power, 2015-03-05 00:14:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/979813004/60001

[commit-bot: I haz the power, 2015-03-05 01:12:07]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-03-05 01:12:55]

Patchset 4 (id:??) landed as
https://crrev.com/fe9592fc2e2bcfb64ecb22eb2dbcee139a6797e6
Cr-Commit-Position: refs/heads/master@{#319186}