Converted accessibility_unittests to run on Swarming everywhere.

testing/buildbot/chromium_memory_trybot.json

 {
   "gtest_tests": [
     "accessibility_unittests",
     {
-      "test": "base_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "base_unittests"
     },
     {
-      "test": "browser_tests",
       "swarming": {
         "can_use_on_swarming_builders": true,
         "shards": 10
-      }
+      },
+      "test": "browser_tests"
     },
     "cacheinvalidation_unittests",
     {
-      "test": "cc_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "cc_unittests"
     },
     {
-      "test": "components_browsertests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "components_browsertests"
     },
     {
-      "test": "components_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "components_unittests"
     },
     {
-      "test": "content_browsertests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "content_browsertests"
     },
     {
-      "test": "content_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "content_unittests"
     },
     {
-      "test": "crypto_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "crypto_unittests"
     },
     "device_unittests",
     {
-      "test": "display_unittests",
-      "platforms": ["linux"]
+      "platforms": [
+        "linux"
+      ],
+      "test": "display_unittests"
     },
     "extensions_unittests",
     "gcm_unit_tests",
     "gfx_unittests",
     "google_apis_unittests",
     {
-      "test": "gpu_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "gpu_unittests"
     },
     {
-      "test": "interactive_ui_tests",
       "swarming": {
         "can_use_on_swarming_builders": true,
         "shards": 3
-      }
+      },
+      "test": "interactive_ui_tests"
     },
     "ipc_tests",
     "jingle_unittests",
     {
-      "test": "media_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
-      }
+      },
+      "test": "media_unittests"
     },
     {
-      "test": "net_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true,
         "shards": 2
-      }
+      },
+      "test": "net_unittests"
     },
     "ppapi_unittests",
     "printing_unittests",
     "remoting_unittests",
     {
-      "test": "sandbox_linux_unittests",
-      "platforms": ["linux"]
+      "platforms": [
+        "linux"
+      ],
+      "test": "sandbox_linux_unittests"
     },
     "skia_unittests",
     "sql_unittests",
     "sync_unit_tests",
     "ui_base_unittests",
     {
-      "test": "unit_tests",
       "swarming": {
         "can_use_on_swarming_builders": true,
         "shards": 2
-      }
+      },
+      "test": "unit_tests"
     },
     "url_unittests"
   ]
 }