Revert of Let DM run unit tests.

Revert of Let DM run unit tests. (https://codereview.chromium.org/178273002/)

Reason for revert:
broke tests

Original issue's description:
> Let DM run unit tests.
>   - refactor GYPs and a few flags
>   - make GPU tests grab a thread-local GrContextFactory when needed as we do in DM for GMs
>   - add a few more UI features to make DM more like tests
> 
> I believe this makes the program 'tests' obsolete.
> 
> It should be somewhat faster to run the two sets together than running the old binaries serially: 
>   - serial: tests 20s (3m18s CPU), dm 21s (3m01s CPU)
>   - together: 27s (6m21s CPU)
> 
> Next up is to incorporate benches.  I'm only planning there on a single-pass sanity check, so that won't obsolete the program 'bench' just yet.
> 
> Tested: out/Debug/tests && out/Debug/dm && echo ok
> BUG=skia:
> 
> Committed: http://code.google.com/p/skia/source/detail?r=13586

TBR=bsalomon@google.com,mtklein@google.com,tfarina@chromium.org,mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: http://code.google.com/p/skia/source/detail?r=13587

[reed1, 2014-02-25 20:01:49]

Created Revert of Let DM run unit tests.

[commit-bot: I haz the power, 2014-02-25 20:01:58]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/reed@google.com/179403010/1

[commit-bot: I haz the power, 2014-02-25 20:02:17]

Change committed as 13587