Move all core files in //components/sessions into core/ subdir

components/sessions/session_command.cc

-// Copyright 2006 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 <limits>
-
-#include "base/pickle.h"
-#include "components/sessions/session_command.h"
-
-namespace sessions {
-
-SessionCommand::SessionCommand(id_type id, size_type size)
-    : id_(id),
-      contents_(size, 0) {
-}
-
-SessionCommand::SessionCommand(id_type id, const base::Pickle& pickle)
-    : id_(id),
-      contents_(pickle.size(), 0) {
-  DCHECK(pickle.size() < std::numeric_limits<size_type>::max());
-  memcpy(contents(), pickle.data(), pickle.size());
-}
-
-bool SessionCommand::GetPayload(void* dest, size_t count) const {
-  if (size() != count)
-    return false;
-  memcpy(dest, &(contents_[0]), count);
-  return true;
-}
-
-base::Pickle* SessionCommand::PayloadAsPickle() const {
-  return new base::Pickle(contents(), static_cast<int>(size()));
-}
-
-}  // namespace sessions