Revert "Support disabling unit test batching. Use it for angle_end2end_tests"

Revert "Support disabling unit test batching. Use it for angle_end2end_tests"

This reverts commit 915c316c3431e193be1b025c557b5eee557e22d0.

This change seems to be breaking the angle_end2end_tests on Windows
GPU FYI bots:

http://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28NVIDIA%29
http://build.chromium.org/p/chromium.gpu.fyi/builders/Win8%20Release%20%28NVIDIA%29
http://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28ATI%29
http://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20dEQP%20%28NVIDIA%29

e.g.,

[1/949] EGLSurfaceTest.MessageLoopBug (UNKNOWN)
[2/949] EGLSurfaceTest.MessageLoopBugContext (UNKNOWN)
[3/949] EGLSurfaceTest.MakeCurrentTwice (UNKNOWN)
[4/949] EGLSurfaceTest.ResizeD3DWindow (UNKNOWN)
...

http://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28NVIDIA%29/builds/16863/steps/angle_end2end_tests/logs/stdio

BUG=501604
TBR=phadjanjr@chromium.org,geofflang@chromium.org

Committed: https://crrev.com/9dbed546384c617954e36ac755f1786de59fae3b
Cr-Commit-Position: refs/heads/master@{#336559}

[Stephen White, 2015-06-29 13:55:29]

senorblanco@chromium.org changed reviewers:
+ geofflang@chromium.org, phajdan.jr@chromium.org

[Stephen White, 2015-06-29 13:55:47]

The CQ bit was checked by senorblanco@chromium.org

[commit-bot: I haz the power, 2015-06-29 13:55:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1218843002/1

[commit-bot: I haz the power, 2015-06-29 14:54:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-29 14:55:37]

Patchset 1 (id:??) landed as
https://crrev.com/9dbed546384c617954e36ac755f1786de59fae3b
Cr-Commit-Position: refs/heads/master@{#336559}