Move macOS WPT chunk 1 (only) from Buildbot to Taskcluster

etc/taskcluster/decision_task.py

@@ -21,9 +21,6 @@ def main(task_for):
         magicleap_dev = linux_arm32_dev = linux_arm64_dev = \
             android_arm32_dev_from_macos = lambda: None
 
-        # FIXME: not enabled yet
-        macos_wpt = lambda: None
-
         # FIXME https://github.com/servo/servo/issues/22187
         # In-emulator testing is disabled for now. (Instead we only compile.)
         # This local variable shadows the module-level function of the same name.
@@ -82,8 +79,6 @@ def main(task_for):
 # but should still run when testing this Python code. (See `mock.py`.)
 def mocked_only():
     windows_release()
-    linux_wpt()
-    macos_wpt()
     android_x86_wpt()
     decisionlib.DockerWorkerTask("Indexed by task definition").find_or_create()
 
@@ -343,7 +338,7 @@ def macos_wpt():
     def macos_run_task(name):
         return macos_task(name).with_python2()
     wpt_chunks("macOS x64", macos_run_task, build_task, repo_dir="repo",
-               total_chunks=6, processes=4)
+               total_chunks=6, processes=4, chunks=[1])
 
 
 def wpt_chunks(platform, make_chunk_task, build_task, total_chunks, processes,