Convert sql_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 6e1ece16e1d019c80fdc2dbad7cda06187f70a2e..11f5182d5d8d63b82ea22ec05a9f89daf42a8add 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -211,6 +211,9 @@
         "test": "skia_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sql_unittests"
       },
       {
@@ -497,6 +500,9 @@
         "test": "skia_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sql_unittests"
       },
       {
@@ -902,6 +908,9 @@
         "test": "skia_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sql_unittests"
       },
       {
@@ -1167,6 +1176,9 @@
         "test": "skia_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sql_unittests"
       },
       {
@@ -1591,6 +1603,9 @@
         "test": "skia_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "sql_unittests"
       },
       {