Truncate long extension titles for webstore installs.

Truncate long extension titles for webstore installs.

XIB change:
* Sets the header field to be truncated rather than wrapped.

BUG=417317
TEST=as in bug

Committed: https://crrev.com/04cc6d8b71d8e2fd425a08c3f671922d7ce1d660
Cr-Commit-Position: refs/heads/master@{#296714}

[Avi (use Gerrit), 2014-09-24 19:39:55]

avi@chromium.org changed reviewers:
+ rdevlin.cronin@chromium.org, rsesek@chromium.org

[Avi (use Gerrit), 2014-09-24 19:39:56]

rsesek: Mac review
rdevlin: Extensions review

[Devlin, 2014-09-24 20:08:57]

On 2014/09/24 19:39:56, Avi wrote:
> rsesek: Mac review
> rdevlin: Extensions review

screenshots in bug LGTM. I don't really know xib, so I'll let Robert take that.

[Robert Sesek, 2014-09-25 14:57:31]

LGTM

[Avi (use Gerrit), 2014-09-25 15:21:30]

The CQ bit was checked by avi@chromium.org

[commit-bot: I haz the power, 2014-09-25 15:22:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/605463002/1

[commit-bot: I haz the power, 2014-09-25 16:03:45]

Committed patchset #1 (id:1) as 18d8c532ccee6b0fd7b63e278ae5699de6edc95f

[commit-bot: I haz the power, 2014-09-25 16:04:44]

Patchset 1 (id:??) landed as
https://crrev.com/04cc6d8b71d8e2fd425a08c3f671922d7ce1d660
Cr-Commit-Position: refs/heads/master@{#296714}