Remove obsolete fields in quic_protocol and their current usage in QUIC. Reorders QuicAckFrame fie…

net/quic/quic_fec_group_interface.cc

-// Copyright (c) 2012 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.
-
-#include "net/quic/quic_fec_group_interface.h"
-
-#include <limits>
-
-#include "base/logging.h"
-#include "base/stl_util.h"
-
-namespace net {
-
-void QuicFecGroupInterface::XorBuffers(const char* input,
-                                       size_t size_in_bytes,
-                                       char* output) {
-#if defined(__i386__) || defined(__x86_64__)
-  // On x86, alignment is not required and casting bytes to words is safe.
-
-  // size_t is a reasonable approximation of how large a general-purpose
-  // register is for the platforms and compilers Chrome is built on.
-  typedef size_t platform_word;
-  const size_t size_in_words = size_in_bytes / sizeof(platform_word);
-
-  const platform_word* input_words =
-      reinterpret_cast<const platform_word*>(input);
-  platform_word* output_words = reinterpret_cast<platform_word*>(output);
-
-  // Handle word-sized part of the buffer.
-  size_t offset_in_words = 0;
-  for (; offset_in_words < size_in_words; offset_in_words++) {
-    output_words[offset_in_words] ^= input_words[offset_in_words];
-  }
-
-  // Handle the tail which does not fit into the word.
-  for (size_t offset_in_bytes = offset_in_words * sizeof(platform_word);
-       offset_in_bytes < size_in_bytes; offset_in_bytes++) {
-    output[offset_in_bytes] ^= input[offset_in_bytes];
-  }
-#else
-  // On ARM and most other plaforms, the code above could fail due to the
-  // alignment errors.  Stick to byte-by-byte comparison.
-  for (size_t offset = 0; offset < size_in_bytes; offset++) {
-    output[offset] ^= input[offset];
-  }
-#endif /* defined(__i386__) || defined(__x86_64__) */
-}
-
-}  // namespace net