Cherry-pick: Deny the geolocation permission request by default.

Cherry-pick: Deny the geolocation permission request by default.

This patch denies the request if there is no response when GeolocationPermission.Callback object is gc-ed.

TBR=boliu
BUG=513752
NOTRY=true
NOPRESUBMIT=true
Review URL: https://codereview.chromium.org/1267103003

Cr-Commit-Position: refs/heads/master@{#341760}
(cherry picked from commit 97d22bb63d36d4d3049ef8f4009503acefb72bc9)

[michaelbai, 2015-08-05 18:22:07]

The CQ bit was checked by michaelbai@chromium.org

[commit-bot: I haz the power, 2015-08-05 18:23:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1277563002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1277563002/1

[commit-bot: I haz the power, 2015-08-05 18:23:23]

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

[commit-bot: I haz the power, 2015-08-05 18:23:24]

CLs for remote refs other than refs/pending/heads/master must contain NOTRY=true
and NOPRESUBMIT=true in order for the CQ to process them

[michaelbai, 2015-08-05 18:34:46]

The CQ bit was checked by michaelbai@chromium.org

[commit-bot: I haz the power, 2015-08-05 18:35:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1277563002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1277563002/1

[commit-bot: I haz the power, 2015-08-05 18:37:28]

Committed patchset #1 (id:1)