Revert of Convert ipc_mojo_unittests to run exclusively on Swarming

testing/buildbot/chromium.fyi.json

Index: testing/buildbot/chromium.fyi.json
diff --git a/testing/buildbot/chromium.fyi.json b/testing/buildbot/chromium.fyi.json
index ced51d11d355dcbcb7d091c44b5d28e6f9af627c..0767b2eab7deb7291f9072246dc59bd38e76a2a0 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -255,9 +255,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -428,9 +425,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -563,9 +557,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -737,9 +728,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -2994,9 +2982,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -3441,9 +3426,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {