[Permission Bubble] Allow re-display after ESC

[Permission Bubble] Allow re-display after ESC

Permission bubbles on Mac would not re-display for new permissions after
dismissing a bubble with ESC.

The root cause is that ESC would close the bubble, but not clean out the
pending requests. This change ensures pending requests are removed when
a bubble closes, for whatever reason.

BUG=385088
TEST= 1) Navigate to adrifelt.github.io/demos/all-permissions.html
      2) Click on location, observer permission bubble popping up.
      3) Click in permission bubble to give focus to bubble - DO NOT
         click on any UI elements in the bubble, just the text.
      4) Press ESC, observe bubble being dismissed.
      5) Click on "notifications" on the web page. With the change,
         observe a new bubble. Without, no new bubble.

Committed: https://crrev.com/3f2fe29dce19b9ed2479313fd6ee631a160a23f6
Cr-Commit-Position: refs/heads/master@{#330950}

[groby-ooo-7-16, 2015-05-20 19:56:09]

groby@chromium.org changed reviewers:
+ felt@chromium.org

[groby-ooo-7-16, 2015-05-20 19:56:16]

PTAL

[felt, 2015-05-21 17:02:51]

On 2015/05/20 19:56:16, groby wrote:
> PTAL

Is this what made you notice the issue with the test mocks?

[felt, 2015-05-21 17:03:21]

lgtm, good find

[groby-ooo-7-16, 2015-05-21 17:06:54]

You'll love to hear that there might be other loopholes where the bubble might
get stuck. (I've got no proof, but the code is sufficiently complex)

[groby-ooo-7-16, 2015-05-21 17:07:29]

The CQ bit was checked by groby@chromium.org

[commit-bot: I haz the power, 2015-05-21 17:08:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1137543004/1

[felt, 2015-05-21 17:11:46]

On 2015/05/21 17:06:54, groby wrote:
> You'll love to hear that there might be other loopholes where the bubble might
> get stuck. (I've got no proof, but the code is sufficiently complex)

i'll just be over here sobbing quietly in my morning tea

speaking of which, i'm back on bubble bug-fixing as of now... let the hunt
(re-)begin

[commit-bot: I haz the power, 2015-05-21 17:59:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-21 18:00:08]

Patchset 1 (id:??) landed as
https://crrev.com/3f2fe29dce19b9ed2479313fd6ee631a160a23f6
Cr-Commit-Position: refs/heads/master@{#330950}