[fuchsia] Build and run gin_unittests as a CFv2 component.

Bug: 1256502
Change-Id: I5645965d213bf54d2b9e5175fe17a3fa2d2a14a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3545447
Reviewed-by: Benjamin Lerman <qsr@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#985877}

gin/BUILD.gn

@@ -195,10 +195,8 @@ test("gin_unittests") {
   }
 
   if (is_fuchsia) {
-    use_cfv2 = false
-    additional_manifest_fragments = [
-      # TODO(crbug.com/1185811): Figure out why jit_capabilities is needed.
-      "//build/config/fuchsia/test/jit_capabilities.test-cmx",
-    ]
+    # TODO(https://crbug.com/1185811): Investigate removing the requirement for
+    # job_policy_ambient_mark_vmo_exec for the sake of V8's allocator in tests.
+    test_runner_shard = "//build/config/fuchsia/test/elf_test_ambient_exec_runner.shard.test-cml"
   }
 }