Remove unused GeolocationDispatcher::geolocationDestroyed().

Remove unused GeolocationDispatcher::geolocationDestroyed().

As of Blink r180944, Blink is no longer notifying the embedder of its
GeolocationController reference going away (as there's no need.) Follow
up and retire the notification implementation on the embedder side.

R=mvanouwerkerk@chromium.org, jochen@chromium.org
BUG=

Committed: https://crrev.com/46343cfc3ce2ca18ccfed5da9df28c06d7437c6c
Cr-Commit-Position: refs/heads/master@{#292890}

[sof, 2014-09-01 13:02:51]

sigbjornf@opera.com changed reviewers:
+ mvanouwerkerk@chromium.org, tkent@chromium.org

[sof, 2014-09-01 13:02:51]

Please take a look.

[Michael van Ouwerkerk, 2014-09-01 13:13:14]

lgtm

[sof, 2014-09-01 13:27:27]

sigbjornf@opera.com changed reviewers:
+ jochen@chromium.org

[sof, 2014-09-01 13:27:27]

mvanouwerkerk@: thanks, looks like geolocation ownership isn't set up for you
for this particular class.

jochen@, tkent@: could you have an owner look, please? tia.

[jochen (gone - plz use gerrit), 2014-09-01 13:42:13]

lgtm

[sof, 2014-09-01 13:53:07]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-09-01 13:53:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sigbjornf@opera.com/526123002/1

[commit-bot: I haz the power, 2014-09-01 19:20:12]

Committed patchset #1 (id:1) as 20daf37c655b59f34cd98406651d9f0819e4869b

[commit-bot: I haz the power, 2014-09-10 03:17:26]

Patchset 1 (id:??) landed as
https://crrev.com/46343cfc3ce2ca18ccfed5da9df28c06d7437c6c
Cr-Commit-Position: refs/heads/master@{#292890}