Update extension permission histogram

Update extension permission histogram

This adds histogram values for extension permission messages that
are missing.

BUG=None
TEST=None

Committed: https://crrev.com/1c45aec35f3cbb85ed20273d204c2126cf1de275
Cr-Commit-Position: refs/heads/master@{#322474}

[tbarzic, 2015-03-26 18:29:20]

tbarzic@chromium.org changed reviewers:
+ isherman@chromium.org, yoz@chromium.org

[Yoyo Zhou, 2015-03-26 19:47:35]

LGTM, thanks for doing this.

[Ilya Sherman, 2015-03-26 20:26:35]

LGTM.  Thanks, Toni :)

[tbarzic, 2015-03-26 20:27:21]

On 2015/03/26 20:26:35, Ilya Sherman wrote:
> LGTM.  Thanks, Toni :)

np :)

[tbarzic, 2015-03-26 20:27:25]

The CQ bit was checked by tbarzic@chromium.org

[commit-bot: I haz the power, 2015-03-26 20:27:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1037053003/1

[commit-bot: I haz the power, 2015-03-26 21:26:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-26 21:27:01]

Patchset 1 (id:??) landed as
https://crrev.com/1c45aec35f3cbb85ed20273d204c2126cf1de275
Cr-Commit-Position: refs/heads/master@{#322474}