Revert of Initial ServiceWorker Cache API polyfill. (https://codereview.chromium.org/314133002/)

Reason for revert:
Triggering buffer overflow checks on Linux ASAN:
http://build.chromium.org/p/chromium.memory/buildstatus?builder=Linux%20ASan%20Tests%20%28sandboxed%29&number=2348

Original issue's description:
> Initial ServiceWorker Cache API polyfill.
> 
> A basic Cache API. No serialization of any kind, no testing, and no
> add() method, as it depends on Fetch().
> 
> R=falken@chromium.org,jkarlin@chromium.org
> TBR=jochen@chromium.org
> BUG=374822
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175749

TBR=falken@chromium.org,jkarlin@chromium.org,jsbell@chromium.org,jochen@chromium.org,gavinp@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=374822

Review URL: https://codereview.chromium.org/319383003

git-svn-id: svn://svn.chromium.org/blink/trunk@175751 bbb929c8-8fbe-4397-9dbb-9b2b20218538