Revert of Run gles2_conform_test on Chromium recipe GPU FYI bots. (patchset #2...

Revert of Run gles2_conform_test on Chromium recipe GPU FYI bots. (patchset #2 id:20001 of https://codereview.chromium.org/1554833002/ )

Reason for revert:
Not working on any of the currently running platforms; see http://crbug.com/573378 .

Original issue's description:
> Run gles2_conform_test on Chromium recipe GPU FYI bots.
>
> BUG=542370
> TBR=dpranke@chromium.org,phajdan.jr@chromium.org
>
> Committed: https://crrev.com/e424e001eb360149291ae0905125629612f5d244
> Cr-Commit-Position: refs/heads/master@{#367235}

TBR=dpranke@chromium.org,phajdan.jr@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=542370

Review URL: https://codereview.chromium.org/1552933002

Cr-Commit-Position: refs/heads/master@{#367239}

testing/buildbot/chromium.gpu.fyi.json

@@ -106,21 +106,6 @@
           ]
         },
         "test": "gl_unittests"
-      },
-      {
-        "args": [
-          "--use-gpu-in-tests"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "10de:104a",
-              "os": "Linux"
-            }
-          ]
-        },
-        "test": "gles2_conform_test"
       }
     ],
     "isolated_scripts": [
@@ -490,21 +475,6 @@
         },
         "test": "gl_unittests"
       },
-      {
-        "args": [
-          "--use-gpu-in-tests"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "10de:104a",
-              "os": "Linux"
-            }
-          ]
-        },
-        "test": "gles2_conform_test"
-      },
       {
         "override_compile_targets": [
           "tab_capture_end2end_tests_run"
@@ -894,22 +864,6 @@
           ]
         },
         "test": "gl_unittests"
-      },
-      {
-        "args": [
-          "--use-gpu-in-tests"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "1002:6821",
-              "hidpi": "1",
-              "os": "Mac-10.10"
-            }
-          ]
-        },
-        "test": "gles2_conform_test"
       }
     ],
     "isolated_scripts": [
@@ -1297,22 +1251,6 @@
         },
         "test": "gl_unittests"
       },
-      {
-        "args": [
-          "--use-gpu-in-tests"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "1002:6821",
-              "hidpi": "1",
-              "os": "Mac-10.10"
-            }
-          ]
-        },
-        "test": "gles2_conform_test"
-      },
       {
         "override_compile_targets": [
           "tab_capture_end2end_tests_run"