CacheStorage: Merge CacheStorageListener into CacheStorageDispatcherHost (2)

CacheStorage: Merge CacheStorageListener into CacheStorageDispatcherHost (2)

CacheStorageListener and CacheStorageDispatcher are now in a 1:1 relationship
and the indirection is no longer necessary. This CL moves the rest of the stuff
to the dispatcher, and removes the listener.

1st CL: https://codereview.chromium.org/1111713002/

BUG=474233
TEST=content_unittests --gtest_filter=CacheStorage*
TEST=run-webkit-tests http/tests/cachestorage/

Committed: https://crrev.com/31aad3b6880b794f916cdd4f1a846a878675080f
Cr-Commit-Position: refs/heads/master@{#327303}

[nhiroki, 2015-04-28 06:49:42]

Patchset #1 (id:1) has been deleted

[nhiroki, 2015-04-28 07:52:10]

Patchset #1 (id:20001) has been deleted

[nhiroki, 2015-04-28 08:43:12]

nhiroki@chromium.org changed reviewers:
+ jsbell@chromium.org

[nhiroki, 2015-04-28 08:43:12]

PTAL, thanks!

[jsbell, 2015-04-28 16:02:42]

lgtm!

[jsbell, 2015-04-28 16:02:45]

The CQ bit was checked by jsbell@chromium.org

[commit-bot: I haz the power, 2015-04-28 16:03:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1107293002/40001

[commit-bot: I haz the power, 2015-04-28 16:51:00]

Committed patchset #1 (id:40001)

[commit-bot: I haz the power, 2015-04-28 16:51:43]

Patchset 1 (id:??) landed as
https://crrev.com/31aad3b6880b794f916cdd4f1a846a878675080f
Cr-Commit-Position: refs/heads/master@{#327303}