Remove unused interpolation reftest functionality

The only interpolation reftests we have are usage samples.
This change removes the unused testing functionality.

Review URL: https://codereview.chromium.org/1022723002

git-svn-id: svn://svn.chromium.org/blink/trunk@192143 bbb929c8-8fbe-4397-9dbb-9b2b20218538
5 files changed
tree: 3dc6b0f8c0d869d5d3d1958db1ed45e4cfeeea94
  1. third_party/