DevTools: Fix row striping in call stack when there are hidden (black-boxed) rows.

The :nth-of-type selector counts hidden elements, so they should not
be in the DOM to do the background color striping correctly.

R=eustas, vsevik

Review URL: https://codereview.chromium.org/831553003

git-svn-id: svn://svn.chromium.org/blink/trunk@187780 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Fix CSS glitch in DataGrid.

The disclosure triangle in DataGrid having no height displays other stuff from the image sprite.

R=eustas, pfeldman
NOTRY=true

Review URL: https://codereview.chromium.org/830643002

git-svn-id: svn://svn.chromium.org/blink/trunk@187781 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Get rid of empty "title" attributes on most TreeElement LI's

R=vsevik

Review URL: https://codereview.chromium.org/798493007

git-svn-id: svn://svn.chromium.org/blink/trunk@187783 bbb929c8-8fbe-4397-9dbb-9b2b20218538