Support binding WeakPtr<> to methods with void return types.

base/callback.h

 // This file was GENERATED by command:
 //     pump.py callback.h.pump
 // DO NOT EDIT BY HAND!!!
 
 
 
 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ skipping 31 matching lines @@
 //
 // EXAMPLE USAGE:
 //
 // /* Binding a normal function. */
 // int Return5() { return 5; }
 // base::Callback<int(void)> func_cb = base::Bind(&Return5);
 // LOG(INFO) << func_cb.Run();  // Prints 5.
 //
 // void PrintHi() { LOG(INFO) << "hi."; }
 // base::Closure void_func_cb = base::Bind(&PrintHi);
-// LOG(INFO) << void_func_cb.Run();  // Prints: hi.
+// void_func_cb.Run();  // Prints: hi.
 //
 // /* Binding a class method. */
 // class Ref : public RefCountedThreadSafe<Ref> {
 //  public:
 //   int Foo() { return 3; }
 //   void PrintBye() { LOG(INFO) << "bye."; }
 // };
 // scoped_refptr<Ref> ref = new Ref();
 // base::Callback<int(void)> ref_cb = base::Bind(&Ref::Foo, ref.get());
 // LOG(INFO) << ref_cb.Run();  // Prints out 3.
@@ skipping 423 matching lines @@
 };
 
 
 // Syntactic sugar to make Callbacks<void(void)> easier to declare since it
 // will be used in a lot of APIs with delayed execution.
 typedef Callback<void(void)> Closure;
 
 }  // namespace base
 
 #endif  // BASE_CALLBACK_H