Retry: Introduce AsyncFileTestHelper for testing with async file/quota operations

Retry: Introduce AsyncFileTestHelper for testing with async file/quota operations

Also gradually deprecate FileUtilHelper since its code is no longer
used in the actual code path (used only in unittests).

Original review (with lgtm): https://codereview.chromium.org/12223006/

No changes made from the original review (the link error should be gone now by other gypi change that is already landed)

BUG=146215
TEST=content_unittests:LocalFileSystem*
TBR=jam, tzik, tbarzic (original reviewers)

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=182193

[kinuko, 2013-02-13 02:51:59]

jochen@ and/or tony@,

Can you take look at the diff from patch set 1 to patch set 2?  I'm trying to
fix the link error caused by the original patch
(https://codereview.chromium.org/12223006/) but am not fully sure how it broke
the build. (Error log: http://goo.gl/aOKya)

Thanks!

[jochen (gone - plz use gerrit), 2013-02-13 08:56:46]

The buildbot link doesn't work, do you have a copy of the error handy?

[kinuko, 2013-02-13 08:58:47]

On 2013/02/13 08:56:46, jochen wrote:
> The buildbot link doesn't work, do you have a copy of the error handy?

Does this shortened link work?
http://goo.gl/aOKya

[kinuko, 2013-02-13 09:20:18]

Per offline chat /w jochen the gypi changes made on top of patchset 1 doesn't
seem necessary. Let met just try landing the original patch again after rebase
on tot. Thx!

[kinuko, 2013-02-13 11:14:40]

TBR-ing original reviewers for http://crrev.com/12223006 (no changes are made
since then)