Support custom message filtering on Mojo binding objects

mojo/public/cpp/bindings/lib/filter_chain.h

Index: mojo/public/cpp/bindings/lib/filter_chain.h
diff --git a/mojo/public/cpp/bindings/lib/filter_chain.h b/mojo/public/cpp/bindings/lib/filter_chain.h
deleted file mode 100644
index 77b8448f794e7431512f70fd917971dc92fe1ea3..0000000000000000000000000000000000000000
--- a/mojo/public/cpp/bindings/lib/filter_chain.h
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright 2014 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.
-
-#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_FILTER_CHAIN_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_FILTER_CHAIN_H_
-
-#include <utility>
-#include <vector>
-
-#include "base/macros.h"
-#include "mojo/public/cpp/bindings/message.h"
-#include "mojo/public/cpp/bindings/message_filter.h"
-
-namespace mojo {
-namespace internal {
-
-class FilterChain {
- public:
-  // Doesn't take ownership of |sink|. Therefore |sink| has to stay alive while
-  // this object is alive.
-  explicit FilterChain(MessageReceiver* sink = nullptr);
-
-  FilterChain(FilterChain&& other);
-  FilterChain& operator=(FilterChain&& other);
-  ~FilterChain();
-
-  template <typename FilterType, typename... Args>
-  inline void Append(Args&&... args);
-
-  // Takes ownership of |filter|.
-  void Append(MessageFilter* filter);
-
-  // Doesn't take ownership of |sink|. Therefore |sink| has to stay alive while
-  // this object is alive.
-  void SetSink(MessageReceiver* sink);
-
-  // Returns a receiver to accept messages. Messages flow through all filters in
-  // the same order as they were appended to the chain. If all filters allow a
-  // message to pass, it will be forwarded to |sink_|.
-  // The returned value is invalidated when this object goes away.
-  MessageReceiver* GetHead();
-
- private:
-  // Owned by this object.
-  // TODO(dcheng): Use unique_ptr.
-  std::vector<MessageFilter*> filters_;
-
-  MessageReceiver* sink_;
-
-  DISALLOW_COPY_AND_ASSIGN(FilterChain);
-};
-
-template <typename FilterType, typename... Args>
-inline void FilterChain::Append(Args&&... args) {
-  Append(new FilterType(std::forward<Args>(args)..., sink_));
-}
-
-template <>
-inline void FilterChain::Append<PassThroughFilter>() {
-}
-
-}  // namespace internal
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_FILTER_CHAIN_H_