Don't disable GPU process when running telemetry_unittests on cros VMs.

That arg has been shown to cause the browser to crash on cros VMs.

Bug: 876494
Change-Id: I217451ce65a78b62a947a8b2b77618875e83dd7f
Reviewed-on: https://chromium-review.googlesource.com/1217913Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590335}

testing/buildbot/chromium.fyi.json

@@ -3196,8 +3196,7 @@
           "--remote=127.0.0.1",
           "--remote-ssh-port=9222",
           "--skip=telemetry.internal.app.android_app_unittest.AndroidAppTest.testWebView",
-          "--skip=telemetry.internal.backends.browser_backend_unittest.BrowserBackendIntegrationTest.testSmokeIsBrowserRunningReturnFalse",
-          "--extra-browser-args=--disable-gpu"
+          "--skip=telemetry.internal.backends.browser_backend_unittest.BrowserBackendIntegrationTest.testSmokeIsBrowserRunningReturnFalse"
         ],
         "isolate_name": "telemetry_unittests",
         "name": "telemetry_unittests",

testing/buildbot/test_suites.pyl

@@ -483,9 +483,6 @@
         # Always fails.
         '--skip=telemetry.internal.app.android_app_unittest.AndroidAppTest.testWebView',
         '--skip=telemetry.internal.backends.browser_backend_unittest.BrowserBackendIntegrationTest.testSmokeIsBrowserRunningReturnFalse',
-        # Disable GPU compositing, telemetry_unittests runs on VMs.
-        # https://crbug.com/871955
-        '--extra-browser-args=--disable-gpu',
       ],
       'swarming': {
         'hard_timeout': 1200,