Check |m_inspectedFrames| in InspectorNetworkAgent to avoid crashes.

Check |m_inspectedFrames| in InspectorNetworkAgent to avoid crashes.

Some methods of InspectorNetworkAgent is not supported in worker thread.
So this CL check |m_inspectedFrames| not to call those methods.

BUG=685493

[horo, 2017-01-26 04:53:57]

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

[horo, 2017-01-26 04:57:12]

Description was changed from

==========
check

BUG=
==========

to

==========
Check |m_inspectedFrames| in InspectorNetworkAgent to avoid crashes.

Some methods of InspectorNetworkAgent is not supported in worker thread.
So this CL check |m_inspectedFrames| not to call those methods.

BUG=685493
==========

[horo, 2017-01-26 04:58:36]

horo@chromium.org changed reviewers:
+ pfeldman@chromium.org

[horo, 2017-01-26 04:58:36]

pfeldman@
Could you please review this?

[pfeldman1, 2017-01-26 05:39:48]

But those were not instrumented, what code is calling into them? Also, you add
these gards in methods that don't use the field you guard against, which makes
the code look weird. Let's revert and do the proper review of the fix.

[horo, 2017-01-26 05:50:15]

On 2017/01/26 05:39:48, pfeldman1 wrote:
> But those were not instrumented, what code is calling into them? Also, you add
> these gards in methods that don't use the field you guard against, which makes
> the code look weird. Let's revert and do the proper review of the fix.

OK I will land the revert patch.
https://codereview.chromium.org/2654433012/