Convert components_unittests to Swarming.

testing/buildbot/chromium.memory.json

Index: testing/buildbot/chromium.memory.json
diff --git a/testing/buildbot/chromium.memory.json b/testing/buildbot/chromium.memory.json
index df3f6ac1babe6a1dbb0ad82a50f64b678418f673..c607dad961d374c822afc49d41ec0384e15a7f47 100644
--- a/testing/buildbot/chromium.memory.json
+++ b/testing/buildbot/chromium.memory.json
@@ -30,6 +30,9 @@
         "test": "cc_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "components_unittests"
       },
       {
@@ -208,6 +211,9 @@
         "test": "chromeos_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "components_unittests"
       },
       {
@@ -360,6 +366,9 @@
         "test": "chromedriver_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "components_unittests"
       },
       {
@@ -469,6 +478,9 @@
         "test": "chromedriver_unittests"
       },
       {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "components_unittests"
       },
       {