Robustify Internals entry points against detached uses.

Robustify Internals entry points against detached uses.

Fuzzers generate pointless overhead using these test-only methods from
frame-detached contexts. Add required nullchecks throughout.

Simple test case for each of these entry points (w/ --run-layout-test):

 <a href="javascript:'replaced'" id=anchor>click</a>
 <script>
 anchor.click();
 internals.someMethod();
 console.log('no crash');
 </script>

R=
BUG=624549
Committed: https://crrev.com/7cbd7fb7916064d9a72b099c7ea6d1d5c9e769a1
Cr-Commit-Position: refs/heads/master@{#403421}

[sof, 2016-06-30 21:09:43]

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

[sof, 2016-06-30 21:09:44]

please take a look.

[haraken, 2016-07-01 00:31:54]

LGTM

[sof, 2016-07-01 05:40:21]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-07-01 05:40:32]

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, 2016-07-01 07:24:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-01 07:24:13]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-01 07:26:18]

Description was changed from

==========
Robustify Internals entry points against detached uses.

Fuzzers generate pointless overhead using these test-only methods from
frame-detached contexts. Add required nullchecks throughout.

Simple test case for each of these entry points (w/ --run-layout-test):

 <a href="javascript:'replaced'" id=anchor>click</a>
 <script>
 anchor.click();
 internals.someMethod();
 console.log('no crash');
 </script>

R=
BUG=624549
==========

to

==========
Robustify Internals entry points against detached uses.

Fuzzers generate pointless overhead using these test-only methods from
frame-detached contexts. Add required nullchecks throughout.

Simple test case for each of these entry points (w/ --run-layout-test):

 <a href="javascript:'replaced'" id=anchor>click</a>
 <script>
 anchor.click();
 internals.someMethod();
 console.log('no crash');
 </script>

R=
BUG=624549

Committed: https://crrev.com/7cbd7fb7916064d9a72b099c7ea6d1d5c9e769a1
Cr-Commit-Position: refs/heads/master@{#403421}
==========

[commit-bot: I haz the power, 2016-07-01 07:26:19]

Patchset 1 (id:??) landed as
https://crrev.com/7cbd7fb7916064d9a72b099c7ea6d1d5c9e769a1
Cr-Commit-Position: refs/heads/master@{#403421}