Revert of skia: Add 'skia_unittests' test suite for this directory.

Revert of skia: Add 'skia_unittests' test suite for this directory. (patchset #12 id:220001 of https://codereview.chromium.org/815023003/)

Reason for revert:
Fails linking on the Mac GN builder:
http://build.chromium.org/p/chromium.mac/builders/Mac%20GN/builds/2094
duplicate symbol __ZN3gfx27SkMatrixToCGAffineTransformERK8SkMatrix in:
    obj/skia/ext/skia_unittests.skia_utils_mac_unittest.o
    obj/skia/ext/skia.skia_utils_mac.o
(and more similar issues)

Original issue's description:
> skia: Add 'skia_unittests' test suite for this directory.
>
> This should be a lightweight test suite that should allow a dev changing
> something in skia/ext to test it much more quickly than having to build
> all 'unit_tests' target just to run the tests from skia/ext.
>
> BUG=444058
> TEST=skia_unittests links and runs fine.
> R=danakj@chromium.org,thakis@chromium.org
>
> Committed: https://crrev.com/c87c3d2d949f9ba4f17627dc023b303c75b7635f
> Cr-Commit-Position: refs/heads/master@{#310310}

TBR=danakj@chromium.org,thakis@chromium.org,glider@chromium.org,sky@chromium.org,tfarina@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=444058
Committed: https://crrev.com/164a39b1806a6261868bc6b2103e24b543251669
Cr-Commit-Position: refs/heads/master@{#310314}

[Marijn Kruisselbrink, 2015-01-07 17:50:27]

Created Revert of skia: Add 'skia_unittests' test suite for this directory.

[commit-bot: I haz the power, 2015-01-07 17:50:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/816803003/1

[commit-bot: I haz the power, 2015-01-07 17:52:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-07 17:52:56]

Patchset 1 (id:??) landed as
https://crrev.com/164a39b1806a6261868bc6b2103e24b543251669
Cr-Commit-Position: refs/heads/master@{#310314}

[Alexander Potapenko, 2015-01-12 09:20:51]

On 2015/01/07 17:52:56, I haz the power (commit-bot) wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/164a39b1806a6261868bc6b2103e24b543251669
> Cr-Commit-Position: refs/heads/master@{#310314}

rslgtm