Web Animations: Remove confusing interpolation subdirectory.

Web Animations: Remove confusing interpolation subdirectory.

The current distribution of files doesn't make sense. I have an idea for a
better split that I'd like to try, but that's speculative, so first we should
reset to a good state.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178534

[shans, 2014-07-21 00:41:56]

The current distribution of files doesn't make sense. I have an idea for a
better split that I'd like to try, but that's speculative, so first we should
reset to a good state.

[alancutter (OOO until 2018), 2014-07-21 01:12:36]

lgtm after talking about the future restructuring plans with shans.

[dstockwell, 2014-07-21 01:34:43]

lgtm

[commit-bot: I haz the power, 2014-07-21 01:35:53]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/shans@chromium.org/408443004/1

[commit-bot: I haz the power, 2014-07-21 02:37:24]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/17966)

[commit-bot: I haz the power, 2014-07-21 03:04:00]

Change committed as 178534