Revert of scheduler: Always create a real scheduler in unit tests

components/scheduler/scheduler.gyp

Index: components/scheduler/scheduler.gyp
diff --git a/components/scheduler/scheduler.gyp b/components/scheduler/scheduler.gyp
index cffc0726e6e469422f18225ea61c9909c9fabe97..e77be8530d62e58e8b1765abbff35dc426d126a8 100644
--- a/components/scheduler/scheduler.gyp
+++ b/components/scheduler/scheduler.gyp
@@ -50,16 +50,5 @@
         '../../third_party/WebKit/public/blink.gyp:blink',
       ],
     },
-    {
-      # GN version: //components/scheduler:test_support
-      'target_name': 'scheduler_test_support',
-      'type': 'static_library',
-      'include_dirs': [
-        '../..',
-      ],
-      'sources': [
-        '<@(scheduler_test_support_sources)',
-      ],
-    },
   ],
 }