Promote all passing tests on linux-chromeos-google-rel out of experiment.

The remaining tests appear sufficiently stable (ie haven't failed in the
past dozen or so builds).

R=jbudorick, martiniss

Bug: 932269
Change-Id: I1c70981c0baba2da1bd7ef40ada22c69daaa8cdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1642132Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665917}

testing/buildbot/mixins.pyl

@@ -167,9 +167,6 @@
   'code-coverage': {
     'isolate_coverage_data': True,
   },
-  'experimental': {
-    'experiment_percentage': 100,
-  },
   'flounder': {
     # Nexus 9
     'swarming': {

testing/buildbot/test_suite_exceptions.pyl

@@ -87,6 +87,11 @@
           'shards': 21,
         },
       },
+      'linux-chromeos-google-rel': {
+        # TODO(https://crbug.com/932269): Promote out of experiment when the
+        # tests are green.
+        'experiment_percentage': 100,
+      },
       'linux-chromeos-oobe-code-coverage': {
         'swarming': {
           'shards': 21,
@@ -735,6 +740,11 @@
       'Win10 Tests x64 (dbg)': {
         'experiment_percentage': 100,
       },
+      'linux-chromeos-google-rel': {
+        # TODO(https://crbug.com/932269): Promote out of experiment when the
+        # tests are green.
+        'experiment_percentage': 100,
+      },
     },
   },
   'monochrome_public_test_ar_apk': {
@@ -1456,6 +1466,11 @@
           'shards': 8,
         },
       },
+      'linux-chromeos-google-rel': {
+        # TODO(https://crbug.com/932269): Promote out of experiment when the
+        # tests are green.
+        'experiment_percentage': 100,
+      },
     },
   },
   'video_decode_accelerator_gl_unittest': {
@@ -1476,6 +1491,11 @@
           'shards': 20,
         },
       },
+      'linux-chromeos-google-rel': {
+        # TODO(https://crbug.com/932269): Promote out of experiment when the
+        # tests are green.
+        'experiment_percentage': 100,
+      },
       'linux-chromeos-oobe-code-coverage': {
         'swarming': {
           'shards': 20,

testing/buildbot/waterfalls.pyl

@@ -620,7 +620,6 @@
         ],
         'mixins': [
           'chrome-swarming-pool',
-          'experimental',
           'linux-trusty',
         ],
         'test_suites': {