Enable url_unittests on fuchsia arm64 CI builder.

This test suite is passing on the fuchsia arm64 FYI builder.

Bug: 1054240
Change-Id: I6e5be624827bb0b29aa1aeba91a6009c4cc29a6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591491Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Stephen Roe <steveroe@google.com>
Cr-Commit-Position: refs/heads/master@{#836910}

testing/buildbot/chromium.linux.json

@@ -2876,6 +2876,28 @@
         "test": "ui_base_unittests",
         "test_id_prefix": "ninja://ui/base:ui_base_unittests/"
       },
+      {
+        "args": [
+          "--runner-logs-dir=${ISOLATED_OUTDIR}/runner_logs"
+        ],
+        "merge": {
+          "args": [],
+          "script": "//testing/merge_scripts/standard_gtest_merge.py"
+        },
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "cpu": "arm64",
+              "inside_docker": "1",
+              "os": "Ubuntu-16.04"
+            }
+          ],
+          "service_account": "chromium-tester@chops-service-accounts.iam.gserviceaccount.com"
+        },
+        "test": "url_unittests",
+        "test_id_prefix": "ninja://url:url_unittests/"
+      },
       {
         "args": [
           "--test-launcher-filter-file=../../testing/buildbot/filters/fuchsia.viz_unittests.filter",

testing/buildbot/test_suite_exceptions.pyl

@@ -2707,12 +2707,6 @@
       },
     },
   },
-  'url_unittests': {
-    'remove_from': [
-      # crbug.com/1054240
-      'Fuchsia ARM64',
-    ],
-  },
   'video_decode_accelerator_gl_unittest': {
     'remove_from': [
       # Windows Intel doesn't have the GL extensions to support this test.