Revert of Convert ipc_mojo_unittests to run exclusively on Swarming

testing/buildbot/chromium.linux.json

Index: testing/buildbot/chromium.linux.json
diff --git a/testing/buildbot/chromium.linux.json b/testing/buildbot/chromium.linux.json
index 352fb84316421537ab4969062784d8ecb9ceaade..6cba75300d81221cd3401e94524ea4870893ee92 100644
--- a/testing/buildbot/chromium.linux.json
+++ b/testing/buildbot/chromium.linux.json
@@ -13,9 +13,6 @@
         "test": "html_viewer_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ipc_mojo_unittests"
       },
       {
@@ -607,9 +604,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -634,9 +628,6 @@
         "test": "interactive_ui_tests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ipc_mojo_unittests"
       },
       {
@@ -926,9 +917,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -954,9 +942,6 @@
         "test": "interactive_ui_tests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ipc_mojo_unittests"
       },
       {
@@ -1237,9 +1222,6 @@
         "test": "gfx_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "gl_unittests"
       },
       {
@@ -1264,9 +1246,6 @@
         "test": "interactive_ui_tests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ipc_mojo_unittests"
       },
       {