Implementation of PostTaskAndReply() in MessageLoopProxy and BrowserThread.

base/memory/ref_counted.h

Index: base/memory/ref_counted.h
diff --git a/base/memory/ref_counted.h b/base/memory/ref_counted.h
index 1207ed4cdbb572ae274d5a9c3ac353d698688ed7..d8ed15035e5c6cce1200f0ac8cf026441eee5355 100644
--- a/base/memory/ref_counted.h
+++ b/base/memory/ref_counted.h
@@ -116,6 +116,26 @@ struct DefaultRefCountedThreadSafeTraits {
   }
 };
 
+// Use as Traits parameter to RefCountedThreadSafe in order to override how the
+// RefCountedThreadSafe subclass is destroyed.
+//
+//   class MyFoo : public base::RefCountedThreadSafe<MyFoo, ManualDestruction> {
+//    ...
+//    private:
+//     friend class ManualDestruction;
+//     void DoManualDestruction() {
+//      delete this;  // Or something else that's appropriate.
+//     }
+//   };
+//
+class ManualDestruction {
+ public:
+  template <class T>
+  static void Destruct(const T* x) {
+    T::DoManualDestruction(x);
+  }
+};
+
 //
 // A thread-safe variant of RefCounted<T>
 //