Final step to remove wallClockTime API from animation delegate interface.
Final step to remove wallClockTime API from animation delegate interface.

We are currently removing trying to remove all references to base::Time (wall
clock time) from Chrome/Blink compositor/graphics stack.

This requires multiple two-sided patches. Following the process found at
https://groups.google.com/a/chromium.org/d/msg/chromium-dev/ukaRczAK6t8/0ludyZ1Nu4cJ

The steps are;
 * Adding monotonic only API to Blink's animation delegate interface
   https://codereview.chromium.org/185633002

 * Making the delegate adapter use monotonic only API
   https://codereview.chromium.org/185643002

 * (This Patch) -- Remove the wallClockTime API from Blink/WebKit.
   https://codereview.chromium.org/185393005

BUG=299945

Review URL: https://codereview.chromium.org/185393005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@168889 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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