Revert of Convert compositor_unittests to run exclusively on Swarming

testing/buildbot/chromium.win.json

Index: testing/buildbot/chromium.win.json
diff --git a/testing/buildbot/chromium.win.json b/testing/buildbot/chromium.win.json
index 90521601e9a44bbbf3632169c8e638cb9ac4925e..b0b81434346c28dd508a2b84245229df73a15641 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -63,9 +63,6 @@
         "test": "components_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "compositor_unittests"
       },
       {
@@ -361,9 +358,6 @@
         "test": "components_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "compositor_unittests"
       },
       {
@@ -793,9 +787,6 @@
         "test": "components_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "compositor_unittests"
       },
       {
@@ -1108,9 +1099,6 @@
         "test": "components_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "compositor_unittests"
       },
       {
@@ -1560,9 +1548,6 @@
         "test": "components_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "compositor_unittests"
       },
       {