Fix regression introduced with r159483.  The RenderScrollbar's parent class had the signature of a virtual changed out from under it.

BUG=297477

Review URL: https://codereview.chromium.org/48733005

git-svn-id: svn://svn.chromium.org/blink/trunk@160742 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Clean WebTestDelegate of impurities.

All these 3-sided patches have landed, so we can
return to the reign of pure virtuals.

All Hail Pure Virtuals!

R=eseidel,abarth
BUG=

Review URL: https://codereview.chromium.org/49203004

git-svn-id: svn://svn.chromium.org/blink/trunk@160743 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Expand flakiness of inspector/styles/styles-new-API.html.

It's flaking on Win.

TBR=pfeldman
BUG=273119

Review URL: https://codereview.chromium.org/49463004

git-svn-id: svn://svn.chromium.org/blink/trunk@160744 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove unnecessary exclusion rules from web.gyp.

They should not be necessary anymore, since config.gyp:config already provides
more generic rules matching them and web.gyp:webkit already depends on config.

BUG=None
TEST=build still works.
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/47833002

git-svn-id: svn://svn.chromium.org/blink/trunk@160745 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix a few warnings.

BUG=312287
R=dglazkov@chromium.org

Review URL: https://codereview.chromium.org/49113002

git-svn-id: svn://svn.chromium.org/blink/trunk@160746 bbb929c8-8fbe-4397-9dbb-9b2b20218538