[Extensions] Make UserScriptInjector's script update stricter

[Extensions] Make UserScriptInjector's script update stricter

When user scripts are updated in the renderer, all old scripts are
invalidated. Ensure that we don't UAF and have a valid user script
object in the injector after the update.

BUG=None

Committed: https://crrev.com/dd7a63a41e5db0b2a8cb217a4063a33c19398a6e
Cr-Commit-Position: refs/heads/master@{#415200}

[Devlin, 2016-08-25 18:49:15]

The CQ bit was checked by rdevlin.cronin@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-25 18:50:27]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Devlin, 2016-08-25 18:55:20]

Patchset #2 (id:20001) has been deleted

[Devlin, 2016-08-25 18:56:50]

The CQ bit was checked by rdevlin.cronin@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-25 18:57:56]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-25 21:06:49]

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

[commit-bot: I haz the power, 2016-08-25 21:06:50]

Dry run: This issue passed the CQ dry run.

[Devlin, 2016-08-25 21:11:12]

Patchset #1 (id:1) has been deleted

[Devlin, 2016-08-25 21:11:58]

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

[lazyboy, 2016-08-29 17:45:16]

lgtm.

For some reason, I've not noticed this CL.

[Devlin, 2016-08-29 18:04:45]

The CQ bit was checked by rdevlin.cronin@chromium.org

[Devlin, 2016-08-29 18:05:26]

On 2016/08/29 17:45:16, lazyboy wrote:
> For some reason, I've not noticed this CL.

No worries - wasn't critical. :)  Only happened to notice it at all as a
side-effect of reviewing yours.

[commit-bot: I haz the power, 2016-08-29 18:24:06]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-30 06:07:37]

Committed patchset #1 (id:40001)

[commit-bot: I haz the power, 2016-08-30 06:10:29]

Description was changed from

==========
[Extensions] Make UserScriptInjector's script update stricter

When user scripts are updated in the renderer, all old scripts are
invalidated. Ensure that we don't UAF and have a valid user script
object in the injector after the update.

BUG=None
==========

to

==========
[Extensions] Make UserScriptInjector's script update stricter

When user scripts are updated in the renderer, all old scripts are
invalidated. Ensure that we don't UAF and have a valid user script
object in the injector after the update.

BUG=None

Committed: https://crrev.com/dd7a63a41e5db0b2a8cb217a4063a33c19398a6e
Cr-Commit-Position: refs/heads/master@{#415200}
==========

[commit-bot: I haz the power, 2016-08-30 06:10:31]

Patchset 1 (id:??) landed as
https://crrev.com/dd7a63a41e5db0b2a8cb217a4063a33c19398a6e
Cr-Commit-Position: refs/heads/master@{#415200}