Make mojo::internal::Buffer a non-virtual class.

mojo/public/cpp/bindings/message.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_MESSAGE_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 26 matching lines @@
   void Initialize(size_t capacity, bool zero_initialized);
 
   // Initializes a Message from an existing Mojo MessageHandle.
   void InitializeFromMojoMessage(ScopedMessageHandle message,
                                  uint32_t num_bytes,
                                  std::vector<Handle>* handles);
 
   // Transfers data and handles to |destination|.
   void MoveTo(Message* destination);
 
-  uint32_t data_num_bytes() const { return buffer_->data_num_bytes(); }
+  uint32_t data_num_bytes() const {
+    return static_cast<uint32_t>(buffer_->size());
+  }
 
   // Access the raw bytes of the message.
   const uint8_t* data() const {
     return static_cast<const uint8_t*>(buffer_->data());
   }
 
   uint8_t* mutable_data() { return static_cast<uint8_t*>(buffer_->data()); }
 
   // Access the header.
   const internal::MessageHeader* header() const {
@@ skipping 21 matching lines @@
   void set_request_id(uint64_t request_id) {
     DCHECK(has_request_id());
     static_cast<internal::MessageHeaderWithRequestID*>(header())
         ->request_id = request_id;
   }
 
   // Access the payload.
   const uint8_t* payload() const { return data() + header()->num_bytes; }
   uint8_t* mutable_payload() { return const_cast<uint8_t*>(payload()); }
   uint32_t payload_num_bytes() const {
-    DCHECK(buffer_->data_num_bytes() >= header()->num_bytes);
-    size_t num_bytes = buffer_->data_num_bytes() - header()->num_bytes;
+    DCHECK(data_num_bytes() >= header()->num_bytes);
+    size_t num_bytes = data_num_bytes() - header()->num_bytes;
     DCHECK(num_bytes <= std::numeric_limits<uint32_t>::max());
     return static_cast<uint32_t>(num_bytes);
   }
 
   // Access the handles.
   const std::vector<Handle>* handles() const { return &handles_; }
   std::vector<Handle>* mutable_handles() { return &handles_; }
 
   // Access the underlying Buffer interface.
   internal::Buffer* buffer() { return buffer_.get(); }
@@ skipping 90 matching lines @@
 // the caller should wait on the handle to become readable. Returns
 // MOJO_RESULT_OK if the message was read successfully and should be
 // dispatched, otherwise returns an error code if something went wrong.
 //
 // NOTE: The message hasn't been validated and may be malformed!
 MojoResult ReadMessage(MessagePipeHandle handle, Message* message);
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_H_