Drive: Move inner structures of DriveAPIService under drive namespace.

Drive: Move inner structures of DriveAPIService under drive namespace.

The structures will be shared with BatchRequestBuilder introduced by the
following CLs.

BUG=451917
TEST=None

Committed: https://crrev.com/516b766cd373bf4ad94a75f04559ad9b35746c6c
Cr-Commit-Position: refs/heads/master@{#322958}

[hirono, 2015-03-30 08:21:50]

hirono@chromium.org changed reviewers:
+ mtomasz@chromium.org, tzik@chromium.org

[hirono, 2015-03-30 08:21:51]

@tzik - PTAL chrome/browser/sync_file_system/*
@mtomasz - PTAL others

Thank you!

[mtomasz, 2015-03-30 08:27:36]

In general lgtm. There seem to be compile errors.

[tzik, 2015-03-31 02:15:33]

lgtm

[hirono, 2015-03-31 02:18:58]

The CQ bit was checked by hirono@chromium.org

[hirono, 2015-03-31 02:18:59]

The patchset sent to the CQ was uploaded after l-g-t-m from mtomasz@chromium.org
Link to the patchset: https://codereview.chromium.org/1042803002/#ps2 (title:
"Fix tests.")

[hirono, 2015-03-31 02:19:09]

On 2015/03/31 02:15:33, tzik wrote:
> lgtm

Thank you!

[commit-bot: I haz the power, 2015-03-31 02:19:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1042803002/2

[commit-bot: I haz the power, 2015-03-31 02:23:54]

Committed patchset #2 (id:2)

[commit-bot: I haz the power, 2015-03-31 02:24:47]

Patchset 2 (id:??) landed as
https://crrev.com/516b766cd373bf4ad94a75f04559ad9b35746c6c
Cr-Commit-Position: refs/heads/master@{#322958}