Remove RunLocation from web_view_internal.json.

Remove RunLocation from web_view_internal.json.

Remove this ducplication, and let the "run_at" property to refer
extensionTypes.RunAt.

The CL that fixed the complier bug for JSON is:
https://codereview.chromium.org/1100333006

BUG=477457
Committed: https://crrev.com/f72b8d7108813712061cc43cbdda1a11f6d5bec5
Cr-Commit-Position: refs/heads/master@{#326830}

[Xi Han, 2015-04-24 15:00:36]

hanxi@chromium.org changed reviewers:
+ rdevlin.cronin@chromium.org

[Xi Han, 2015-04-24 15:03:28]

hanxi@chromium.org changed reviewers:
+ kalman@chromium.org
- rdevlin.cronin@chromium.org

[Xi Han, 2015-04-24 15:03:29]

kalman@: I updated the reference after your fix. Please take a look, thanks.

[not at google - send to devlin, 2015-04-24 16:31:49]

cool! lgtm, fix typo on CL description though ("web_view_interanl.json").

[Xi Han, 2015-04-24 17:11:11]

The CQ bit was checked by hanxi@chromium.org

[commit-bot: I haz the power, 2015-04-24 17:11:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1085033006/1

[commit-bot: I haz the power, 2015-04-24 17:39:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-24 17:40:43]

Patchset 1 (id:??) landed as
https://crrev.com/f72b8d7108813712061cc43cbdda1a11f6d5bec5
Cr-Commit-Position: refs/heads/master@{#326830}