Revert of Convert ppapi_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 b1dfb69657a8734ae56a1119303aed81320c214a..b0b81434346c28dd508a2b84245229df73a15641 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -193,9 +193,6 @@
         "test": "net_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ppapi_unittests"
       },
       {
@@ -506,9 +503,6 @@
         "test": "net_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ppapi_unittests"
       },
       {
@@ -938,9 +932,6 @@
         "test": "net_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ppapi_unittests"
       },
       {
@@ -1227,9 +1218,6 @@
         "test": "net_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ppapi_unittests"
       },
       {
@@ -1675,9 +1663,6 @@
         "test": "net_unittests"
       },
       {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ppapi_unittests"
       },
       {