Make the fuchsia mojo/public repo the source of truth.

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

-// 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_SHARED_PTR_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_PTR_H_
-
-#include "mojo/public/cpp/bindings/lib/shared_data.h"
-
-namespace mojo {
-namespace internal {
-
-// Used to manage a heap-allocated instance of P that can be shared via
-// reference counting. When the last reference is dropped, the instance is
-// deleted.
-template <typename P>
-class SharedPtr {
- public:
-  SharedPtr() {}
-
-  explicit SharedPtr(P* ptr) { impl_.mutable_value()->ptr = ptr; }
-
-  // Default copy-constructor and assignment operator are OK.
-
-  P* get() { return impl_.value().ptr; }
-  const P* get() const { return impl_.value().ptr; }
-
-  void reset() { impl_.reset(); }
-
-  P* operator->() { return get(); }
-  const P* operator->() const { return get(); }
-
- private:
-  class Impl {
-   public:
-    ~Impl() {
-      if (ptr)
-        delete ptr;
-    }
-
-    Impl() : ptr(nullptr) {}
-
-    Impl(P* ptr) : ptr(ptr) {}
-
-    P* ptr;
-
-   private:
-    MOJO_DISALLOW_COPY_AND_ASSIGN(Impl);
-  };
-
-  SharedData<Impl> impl_;
-};
-
-}  // namespace mojo
-}  // namespace internal
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_PTR_H_