Revert of [fsp] Add an initial AsyncFileUtil. (https://codereview.chromium.org/236303017/)

Reason for revert:
Broke Linux Chromium OS Tests -- looks like the new tests aren't working properly there.

Failing build: http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/30018

Original issue's description:
> [fsp] Add an initial AsyncFileUtil.
> 
> This patch adds the AsyncFileUtil implementation for the file system provider.
> It does not communicate with the file system provider service yet.
> 
> Currently, for not supported operations SECURITY error is returned. For
> allowed, but not implemented operations, it is NOT_FOUND error.
> 
> Unit tests are quite trivial at this stage, but they will grow once more
> operations are implemented.
> 
> TEST=unit_test: FileSystemProviderAsyncFileUtilTest*
> BUG=248427
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=264462

TBR=kinaba@chromium.org,mtomasz@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=248427

Review URL: https://codereview.chromium.org/240483008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@264475 0039d316-1c4b-4281-b951-d872f2087c98
11 files changed