DevTools: Remove ghost text from FilteredListWidget

DevTools: Remove ghost text from FilteredListWidget

This also converts the FilteredListWidget test to be a unit test,
and adds some extra functionality to inspector-unit-test.js to
handle this.

BUG=660725
Committed: https://crrev.com/37d52357e9b7260b8fe4244d3835d67fef4553c3
Cr-Commit-Position: refs/heads/master@{#429453}

[einbinder, 2016-11-02 18:22:39]

einbinder@chromium.org changed reviewers:
+ lushnikov@chromium.org

[einbinder, 2016-11-02 18:22:40]

This is the reformatted version of https://codereview.chromium.org/2458383003.

[lushnikov, 2016-11-02 20:39:54]

rs lgtm

[einbinder, 2016-11-02 20:56:53]

The CQ bit was checked by einbinder@chromium.org

[commit-bot: I haz the power, 2016-11-02 20:57:44]

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, 2016-11-02 23:37:44]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-02 23:41:20]

Description was changed from

==========
DevTools: Remove ghost text from FilteredListWidget

This also converts the FilteredListWidget test to be a unit test,
and adds some extra functionality to inspector-unit-test.js to
handle this.

BUG=660725
==========

to

==========
DevTools: Remove ghost text from FilteredListWidget

This also converts the FilteredListWidget test to be a unit test,
and adds some extra functionality to inspector-unit-test.js to
handle this.

BUG=660725

Committed: https://crrev.com/37d52357e9b7260b8fe4244d3835d67fef4553c3
Cr-Commit-Position: refs/heads/master@{#429453}
==========

[commit-bot: I haz the power, 2016-11-02 23:41:21]

Patchset 2 (id:??) landed as
https://crrev.com/37d52357e9b7260b8fe4244d3835d67fef4553c3
Cr-Commit-Position: refs/heads/master@{#429453}