[types] Use the TypeCache consistently for common types.

[types] Use the TypeCache consistently for common types.

Rename ZoneTypeCache to TypeCache and use a single shared (immutable)
instance consistently to cache the most commonly used types. Also serves
as a chokepoint for defining those types, so we don't repeat the
definition (and possible bugs) in various places.

R=jarin@chromium.org

Committed: https://crrev.com/23ac686ff8b057a2941b4c34afda52dab280e85e
Cr-Commit-Position: refs/heads/master@{#31631}

[Benedikt Meurer, 2015-10-28 12:30:11]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-10-28 12:30:20]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1409763004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1409763004/1

[commit-bot: I haz the power, 2015-10-28 13:17:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-28 13:17:23]

Dry run: This issue passed the CQ dry run.

[Jarin, 2015-10-28 13:18:52]

lgtm

[Benedikt Meurer, 2015-10-28 13:29:31]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-10-28 13:29:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1409763004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1409763004/1

[commit-bot: I haz the power, 2015-10-28 13:31:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-28 13:31:30]

Patchset 1 (id:??) landed as
https://crrev.com/23ac686ff8b057a2941b4c34afda52dab280e85e
Cr-Commit-Position: refs/heads/master@{#31631}