Revert of CacheStorage: Merge CacheStorageListener into CacheStorageDispatcherHost (1)

Revert of CacheStorage: Merge CacheStorageListener into CacheStorageDispatcherHost (1) (patchset #2 id:140001 of https://codereview.chromium.org/1101733005/)

Reason for revert:
I think this patch caused layouttest failures on the Blink tree, see crbug.com/481784 for details.

Original issue's description:
> CacheStorage: Merge CacheStorageListener into CacheStorageDispatcherHost (1)
>
> CacheStorageListener and CacheStorageDispatcher are now in a 1:1 relationship
> and the indirection is no longer necessary. As a first step of merge, this CL
> moves message handlers for CacheStorage API from the listener to the dispatcher.
>
> BUG=474233
> TEST=content_unittests --gtest_filter=CacheStorage*
>
> Committed: https://crrev.com/34cbfce4cae255c11fb19059ea4a31166768cdcf
> Cr-Commit-Position: refs/heads/master@{#327199}

TBR=jsbell@chromium.org,nhiroki@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=474233, 481784
Committed: https://crrev.com/529b2d0c6a109b6bd5f359832245b64fccab32f7
Cr-Commit-Position: refs/heads/master@{#327229}

[pdr., 2015-04-28 04:00:42]

Created Revert of CacheStorage: Merge CacheStorageListener into
CacheStorageDispatcherHost (1)

[pdr., 2015-04-28 04:01:10]

The CQ bit was checked by pdr@chromium.org

[commit-bot: I haz the power, 2015-04-28 04:01:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1111703002/1

[commit-bot: I haz the power, 2015-04-28 04:02:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-28 04:02:52]

Patchset 1 (id:??) landed as
https://crrev.com/529b2d0c6a109b6bd5f359832245b64fccab32f7
Cr-Commit-Position: refs/heads/master@{#327229}