Stop running webgl2_conformance on the Win x64 Debug FYI bot.

testing/buildbot/chromium.gpu.fyi.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See generate_buildbot_json.py to make changes": {},
   "GPU Linux Builder": {},
   "GPU Linux Builder (dbg)": {},
   "GPU Mac Builder": {},
   "GPU Mac Builder (dbg)": {},
   "GPU Win Builder": {},
   "GPU Win Builder (dbg)": {},
   "GPU Win x64 Builder": {},
@@ skipping 10709 matching lines @@
             }
           ]
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=debug_x64",
           "-v",
-          "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
-          "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
-        ],
-        "isolate_name": "telemetry_gpu_test",
-        "name": "webgl2_conformance_tests",
-        "override_compile_targets": [
-          "telemetry_gpu_test_run"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "10de:104a",
-              "os": "Windows-2008ServerR2-SP1"
-            }
-          ]
-        }
-      },
-      {
-        "args": [
-          "webgl_conformance",
-          "--show-stdout",
-          "--browser=debug_x64",
-          "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc --use-angle=d3d9"
         ],
         "isolate_name": "telemetry_gpu_test",
         "name": "webgl_conformance_d3d9_tests",
         "override_compile_targets": [
           "telemetry_gpu_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
@@ skipping 1517 matching lines @@
             {
               "gpu": "10de:104a",
               "os": "Windows-2012ServerR2-SP0"
             }
           ]
         }
       }
     ]
   }
 }