Revert of Drive: Let DriveUploader use batch request API.

Revert of Drive: Let DriveUploader use batch request API. (patchset #7 id:120001 of https://codereview.chromium.org/1134633003/)

Reason for revert:
MigrationSingleClientTest.AllTypesIndividually is broken by this change on Linux GN:

http://build.chromium.org/p/chromium.linux/builders/Linux%20GN/builds/28327

Original issue's description:
> Drive: Let DriveUploader use batch request API.
>
> The CL lets DriveUploader use batch request API. DriveUploader does asynchronous
> preparation before calling API on service interface. To hold batch request
> during the asynchronous preparation, the CL introduce refcounted hepler class,
> which manages life time of batch request configurator.
>
> BUG=451917
> TEST=DriveUploaderTest
>
> Committed: https://crrev.com/9cf453b74c8790f6d7a91f958ec998a9fa5a1fa0
> Cr-Commit-Position: refs/heads/master@{#329599}

TBR=kinaba@chromium.org,tzik@chromium.org,hirono@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=451917
Committed: https://crrev.com/e244812ae9a09d001f24f9aaaf780c80f976d790
Cr-Commit-Position: refs/heads/master@{#329610}

[sergeyv, 2015-05-13 09:43:24]

Created Revert of Drive: Let DriveUploader use batch request API.

[commit-bot: I haz the power, 2015-05-13 09:57:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135353004/1

[commit-bot: I haz the power, 2015-05-13 09:58:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-13 10:00:29]

Patchset 1 (id:??) landed as
https://crrev.com/e244812ae9a09d001f24f9aaaf780c80f976d790
Cr-Commit-Position: refs/heads/master@{#329610}

[hirono, 2015-05-13 10:18:27]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1138883004/ by hirono@chromium.org.

The reason for reverting is: The failure is not caused by the patch.
MigrationSingleClientTest.AllTypesIndividually looks flaky. 
.