Moves ash content specific tests into ash_content_unittests

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 65fcf6c2fcab999b616772c23ff4b62abcf99c20..1de0773430f54d4c04d8f90ff5363b7487a68029 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -29,6 +29,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "ash_content_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ash_unittests"
       },
       {
@@ -538,6 +544,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "ash_content_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ash_unittests"
       },
       {
@@ -980,6 +992,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "ash_content_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ash_unittests"
       },
       {
@@ -1455,6 +1473,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "ash_content_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ash_unittests"
       },
       {