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

[einbinder, 2016-10-31 23:54:31]

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

[einbinder, 2016-10-31 23:54:31]

ptal

[lushnikov, 2016-11-01 22:15:51]

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
==========

[lushnikov, 2016-11-01 22:35:32]

lgtm

https://codereview.chromium.org/2458383003/diff/1/third_party/WebKit/LayoutTe...
File
third_party/WebKit/LayoutTests/http/tests/inspector-unit/inspector-unit-test.js
(right):

https://codereview.chromium.org/2458383003/diff/1/third_party/WebKit/LayoutTe...
third_party/WebKit/LayoutTests/http/tests/inspector-unit/inspector-unit-test.js:85:
reject("Cannot find method to override: " + methodName);
let's end test?

https://codereview.chromium.org/2458383003/diff/1/third_party/WebKit/Source/d...
File third_party/WebKit/Source/devtools/front_end/ui_lazy/FilteredListWidget.js
(right):

https://codereview.chromium.org/2458383003/diff/1/third_party/WebKit/Source/d...
third_party/WebKit/Source/devtools/front_end/ui_lazy/FilteredListWidget.js:153:
_autocomplete: function()
"We can change this to _tabKeyPressed"(Joel)