Remove WEB_ANIMATION_SUPPORTS_FULL_DIRECTION define

This is the 4th and last part of accelerated direction control.

Now that legacy path in compositor has been removed, the
WEB_ANIMATION_SUPPORTS_FULL_DIRECTION define becomes unneeded.

It builds on top of https://codereview.chromium.org/227733004,
https://codereview.chromium.org/225183014 and
https://codereview.chromium.org/576553002/

BUG=348071

Review URL: https://codereview.chromium.org/572363002

git-svn-id: svn://svn.chromium.org/blink/trunk@182101 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix point conversions in PopupContainer.

This broke when it stopped inheriting ScrollView.

BUG=414598

Review URL: https://codereview.chromium.org/572943003

git-svn-id: svn://svn.chromium.org/blink/trunk@182102 bbb929c8-8fbe-4397-9dbb-9b2b20218538