Move blink scheduler implementation into a component

components/scheduler/child/cancelable_closure_holder.h

Index: components/scheduler/child/cancelable_closure_holder.h
diff --git a/content/child/scheduler/cancelable_closure_holder.h b/components/scheduler/child/cancelable_closure_holder.h
similarity index 80%
rename from content/child/scheduler/cancelable_closure_holder.h
rename to components/scheduler/child/cancelable_closure_holder.h
index 1e3892cc1b2919caec716b9b472f0577e983ac45..20968a46096aa5853cc3fb6dcc75dfa198d8cda3 100644
--- a/content/child/scheduler/cancelable_closure_holder.h
+++ b/components/scheduler/child/cancelable_closure_holder.h
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_CHILD_SCHEDULER_CANCELABLE_CLOSURE_HOLDER_H_
-#define CONTENT_CHILD_SCHEDULER_CANCELABLE_CLOSURE_HOLDER_H_
+#ifndef COMPONENTS_SCHEDULER_CHILD_CANCELABLE_CLOSURE_HOLDER_H_
+#define COMPONENTS_SCHEDULER_CHILD_CANCELABLE_CLOSURE_HOLDER_H_
 
 #include "base/cancelable_callback.h"
 
-namespace content {
+namespace scheduler {
 
 // A CancelableClosureHolder is a CancelableCallback which resets its wrapped
 // callback with a cached closure whenever it is canceled.
@@ -34,6 +34,6 @@ class CancelableClosureHolder {
   DISALLOW_COPY_AND_ASSIGN(CancelableClosureHolder);
 };
 
-}  // namespace content
+}  // namespace scheduler
 
-#endif  // CONTENT_CHILD_SCHEDULER_CANCELABLE_CLOSURE_HOLDER_H_
+#endif  // COMPONENTS_SCHEDULER_CHILD_CANCELABLE_CLOSURE_HOLDER_H_