Cleanup: Remove experimental V8 cache strategies that we discarded.

Cleanup: Remove experimental V8 cache strategies that we discarded.

Remaining are only:
- none (all off),
- parse (formerly parse-memory, the pre-M43 default)
- code (formerly heuristics, the new default)
- default (whatever we think is best. We think "code" is best.)

blink companion CL is forthcoming, and will be submitted right afterwards.

BUG=455187, 399580
Committed: https://crrev.com/9ef1576fb4204023cd78584175bf4a375483c498
Cr-Commit-Position: refs/heads/master@{#335652}

[vogelheim, 2015-06-19 16:18:36]

vogelheim@chromium.org changed reviewers:
+ jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-06-22 08:33:31]

lgtm

[vogelheim, 2015-06-22 14:09:00]

vogelheim@chromium.org changed reviewers:
+ horo@chromium.org

[vogelheim, 2015-06-22 14:09:01]

Hi horo,

This CL is meant to clean up some of my code caching work, but also affects a
bit of ServiceWorker code. You're an SW OWNER: Could you have a look & make sure
I'm not inadvertently breaking anything?

Thanks!

[horo, 2015-06-23 01:52:42]

lgtm

[vogelheim, 2015-06-23 08:20:06]

The CQ bit was checked by vogelheim@chromium.org

[commit-bot: I haz the power, 2015-06-23 08:20:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1192323002/80001

[commit-bot: I haz the power, 2015-06-23 09:55:23]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2015-06-23 09:56:23]

Patchset 5 (id:??) landed as
https://crrev.com/9ef1576fb4204023cd78584175bf4a375483c498
Cr-Commit-Position: refs/heads/master@{#335652}