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The implementing classes and the idl exposing them are removed.
Removed/elevated AbstractAnimationWorkletThread class into actual
AnimationWorkletThread since it is the only one now.

R=majidvp@chromium.org

Bug: 746212
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I0970b5a658fdcbfbb4d45f47be5fd33739778155
Reviewed-on: https://chromium-review.googlesource.com/673484Reviewed-by: Rick Byers <rbyers@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Reviewed-by: Peter Mayo <petermayo@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Peter Mayo <petermayo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504788}