Return void in zoomBy plumbing to match zoomBy public API

Return void in zoomBy plumbing to match zoomBy public API

BUG=410900
Committed: https://crrev.com/5977b553b30e6702bbbbe3da4862fd8afecf49a9
Cr-Commit-Position: refs/heads/master@{#313617}

[paulmiller, 2015-01-28 19:05:28]

paulmiller@chromium.org changed reviewers:
+ sgurun@chromium.org

[paulmiller, 2015-01-28 19:06:17]

This passes android.webkit.cts.WebViewTest#testZoom.

[sgurun-gerrit only, 2015-01-28 20:33:22]

On 2015/01/28 19:06:17, paulmiller wrote:
> This passes android.webkit.cts.WebViewTest#testZoom.

lgtm

[paulmiller1, 2015-01-28 20:35:35]

The CQ bit was checked by paulmiller@google.com

[commit-bot: I haz the power, 2015-01-28 20:36:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/881383002/20001

[commit-bot: I haz the power, 2015-01-28 22:18:29]

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

[commit-bot: I haz the power, 2015-01-28 22:18:29]

Try jobs failed on following builders:
  linux_chromium_asan_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[paulmiller1, 2015-01-28 22:59:53]

The CQ bit was checked by paulmiller@google.com

[commit-bot: I haz the power, 2015-01-28 23:01:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/881383002/20001

[commit-bot: I haz the power, 2015-01-28 23:37:24]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-28 23:39:05]

Patchset 2 (id:??) landed as
https://crrev.com/5977b553b30e6702bbbbe3da4862fd8afecf49a9
Cr-Commit-Position: refs/heads/master@{#313617}