Revert "Run angle_end2end_tests in batches"

This reverts commit 79a6357d.

Reason for revert: Increased the number of failures instead of decreasing

Original change's description:
> Run angle_end2end_tests in batches
> 
> An unknown leak is causing OOM failures on the Intel/Windows bot. While
> that's being investigated, this change unblocks developers by making
> sure the tests are done in batches and memory is reclaimed occasionally.
> 
> Bug: angleproject:3153
> No-Try: True
> Change-Id: Ia03e8996554b308e0bd8a59d13bffc8bde3fbfba
> Reviewed-on: https://chromium-review.googlesource.com/c/1481854
> Commit-Queue: Kenneth Russell <kbr@chromium.org>
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#635377}

TBR=kbr@chromium.org,syoussefi@chromium.org,jmadill@chromium.org

Change-Id: Ie07f4654a694d20bcbd953d353aa39666aa77326
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:3153
Reviewed-on: https://chromium-review.googlesource.com/c/1488510Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635560}

testing/buildbot/test_suites.pyl

@@ -3057,10 +3057,7 @@
           '--use-gpu-in-tests',
           # ANGLE test retries deliberately disabled to prevent flakiness.
           # http://crbug.com/669196
-          '--test-launcher-retry-limit=0',
-          # Work around leaks leading to out-of-memory as the test size grows.
-          # http://anglebug.com/3153
-          '--test-launcher-batch-limit=400'
+          '--test-launcher-retry-limit=0'
         ],
         'should_retry_with_patch': False,
         'swarming': {