Renames SessionChanges and SessionCellData to have a TabSwitcher prefix.

ios/chrome/browser/ui/tab_switcher/session_changes.mm

-// Copyright 2016 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.
-
-#import "ios/chrome/browser/ui/tab_switcher/session_changes.h"
-
-#import "ios/chrome/browser/ui/tab_switcher/tab_switcher_utils.h"
-
-SessionChanges::SessionChanges(
-    std::vector<size_t> const& tabHashesInInitialState,
-    std::vector<size_t> const& tabHashesInFinalState) {
-  TabSwitcherMinimalReplacementOperations(tabHashesInInitialState,
-                                          tabHashesInFinalState, &updates_,
-                                          &deletions_, &insertions_);
-}
-
-SessionChanges::~SessionChanges() {}
-
-std::vector<size_t> const& SessionChanges::deletions() const {
-  return deletions_;
-}
-std::vector<size_t> const& SessionChanges::insertions() const {
-  return insertions_;
-}
-std::vector<size_t> const& SessionChanges::updates() const {
-  return updates_;
-}
-
-bool SessionChanges::hasChanges() const {
-  return updates_.size() || deletions_.size() || insertions_.size();
-}