Rename last two virtual test suites to complete VirtualTestSuite refactoring.

Rename last two virtual test suites to complete VirtualTestSuite refactoring.

Previously we supported two conventions for naming virtual test suites in
the layout tests. The original convention was to map a subpath onto a
different subpath, e.g. "gpu/compositedscrolling/overflow" would map onto
the tests in "compositing/overflow". Later we started to just use a prefix
plus matching the base subpath exactly, so the prior example would instead be
refered to as "gpu/compositing/overflow".

There were two virtual test suites remaining that used the original syntax.
This patch renames those suites and removes the code that supported the syntax.

gpu/compositedscrolling/overflow -> prefer_composited_to_lcd_text/compositing/overflow
gpu/compositedscrolling/scrollbars -> prefer_composited_to_lcd_text/scrollbars

R=enne@chromium.org, ojan@chromium.org
BUG=410210
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181695

[Dirk Pranke, 2014-09-10 01:16:03]

dpranke@chromium.org changed reviewers:
+ kbr@chromium.org
- enne@chromium.org

[Dirk Pranke, 2014-09-10 01:16:08]

Please take a look? Note that all of baseline changes are just moving
directories from point A to point B.

[ojan, 2014-09-10 01:29:29]

The CQ bit was checked by ojan@chromium.org

[ojan, 2014-09-10 01:29:32]

Yay! lgtm. rslgtm on the LayoutTests file moves.

[commit-bot: I haz the power, 2014-09-10 01:29:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dpranke@chromium.org/560563005/1

[commit-bot: I haz the power, 2014-09-10 02:40:21]

Committed patchset #1 (id:1) as 181695

[Ken Russell (switch to Gerrit), 2014-09-10 04:01:15]

LGTM after the fact.