Rename WebAnimation to WebCompositorAnimation

Change WebAnimation to WebCompositorAnimation
Change WebAnimationCurve to WebCompositorAnimationCurve
Change WebAnimationDelegate to WebCompositorAnimationDelegate

This is patch 3 of 3. It builds on http://crrev.com/413983002

BUG=396358

Review URL: https://codereview.chromium.org/412123002

git-svn-id: svn://svn.chromium.org/blink/trunk@179910 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[FileAPI] Check Platform availability before using it in LocalFileSystem

BUG=399803

Review URL: https://codereview.chromium.org/458093002

git-svn-id: svn://svn.chromium.org/blink/trunk@179911 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove flaky expectations for parent-flow-inline-with-block-child.html

It's been green since it was converted to a reftest in r179707:
https://codereview.chromium.org/451483004
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=parent-flow-inline-with-block-child.html

BUG=331576

Review URL: https://codereview.chromium.org/455803002

git-svn-id: svn://svn.chromium.org/blink/trunk@179912 bbb929c8-8fbe-4397-9dbb-9b2b20218538