Disable load:games:miniclip on Mac perf bots

tools/perf/page_sets/system_health/loading_stories.py

Index: tools/perf/page_sets/system_health/loading_stories.py
diff --git a/tools/perf/page_sets/system_health/loading_stories.py b/tools/perf/page_sets/system_health/loading_stories.py
index 5dfef748b3c038c52729b209817357f3546fcef2..3b0532d6bcbe096c9493cb7558e17c48eaef94dd 100644
--- a/tools/perf/page_sets/system_health/loading_stories.py
+++ b/tools/perf/page_sets/system_health/loading_stories.py
@@ -8,6 +8,8 @@ from page_sets.system_health import system_health_story
 from page_sets.login_helpers import dropbox_login
 from page_sets.login_helpers import google_login
 
+from telemetry import decorators
+
 
 class _LoadingStory(system_health_story.SystemHealthStory):
   """Abstract base class for single-page System Health user stories."""
@@ -381,6 +383,7 @@ class LoadSpyChaseStory(_LoadingStory):
         'document.querySelector("#game canvas").style.background !== ""')
 
 
+@decorators.Disabled('mac') # crbug.com/664661
 class LoadMiniclipStory(_LoadingStory):
   NAME = 'load:games:miniclip'
   # Using "https://" causes "404 Not Found" during WPR recording.