On Pixel C, suppress WebGL test failures and stop running gl_tests for now.

testing/buildbot/chromium.gpu.fyi.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See generate_buildbot_json.py to make changes": {},
   "Android Release (Nexus 5)": {
     "gtest_tests": [
       {
         "override_isolate_target": "angle_unittests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
@@ skipping 1546 matching lines @@
             {
               "gpu": "0000:0000",
               "os": "Android"
             }
           ]
         },
         "test": "angle_unittests",
         "use_xvfb": false
       },
       {
-        "override_isolate_target": "gl_tests",
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "0000:0000",
-              "os": "Android"
-            }
-          ]
-        },
-        "test": "gl_tests",
-        "use_xvfb": false
-      },
-      {
         "override_isolate_target": "gl_unittests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "0000:0000",
               "os": "Android"
             }
           ]
         },
@@ skipping 12217 matching lines @@
             {
               "gpu": "10de:104a",
               "os": "Windows-2012ServerR2-SP0"
             }
           ]
         }
       }
     ]
   }
 }