Enable chrome_public_test_apk on android-marshmallow-x86-rel

The test suite runs at 100% since crbug.com/1127110#c33.
Both the test pool (http://shortn/_1u6L1a43uG) and the builder pool
(http://shortn/_8L9MTVnAdc) are in a good shape. So it should be OK to
enable it.

6 tests that fail consistently/flakiy are disabled to make test suite happy.
See crbug.com/1179791 and crbug.com/1179792 for detail.

Also remove it from the following builders.
* android-marshmallow-arm64-rel
* android-marshmallow-x86-rel-non-cq

Bug: 1127110, 1179791, 1179792
Change-Id: I4c03a39863a41e1f40d5670f6c53248d4850c05b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2702383
Commit-Queue: Haiyang Pan <[email protected]>
Reviewed-by: Ben Pastene <[email protected]>
Cr-Commit-Position: refs/heads/master@{#855489}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index e09e97b..2fd28e5d 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -732,6 +732,10 @@
       'android-asan',  # https://crbug.com/964562
       'android-code-coverage-native', # https://crbug.com/1018780
       'android-lollipop-arm-rel', # https://crbug.com/1060245
+
+      # Runs on android-marshmallow-x86-rel already (crbug.com/1127110)
+      'android-marshmallow-arm64-rel',
+      'android-marshmallow-x86-rel-non-cq',
     ],
     'modifications': {
       'Android CFI': {
@@ -766,11 +770,6 @@
           'service_account': '[email protected]'
         },
       },
-      'android-marshmallow-arm64-rel': {
-        'swarming': {
-          'shards': 25,
-        },
-      },
       'android-marshmallow-arm64-rel-swarming': {
         'swarming': {
           'service_account': '[email protected]'
@@ -790,13 +789,6 @@
             },
           ],
         },
-        # TODD(crbug.com/1127110): Remove experimental once it works fine.
-        'experiment_percentage': 100,
-      },
-      'android-marshmallow-x86-rel-non-cq': {
-        'args': [
-          '--test-launcher-filter-file=../../testing/buildbot/filters/android.emulator_m.chrome_public_test_apk.filter',
-        ],
       },
       'android-pie-arm64-rel': {
         'args': [