Revert of [ios] Move WebStateList to ios/chrome/browser/web_state_list.

ios/chrome/browser/web_state_list/web_state_list_order_controller.mm

Index: ios/chrome/browser/web_state_list/web_state_list_order_controller.mm
diff --git a/ios/chrome/browser/web_state_list/web_state_list_order_controller.mm b/ios/chrome/browser/web_state_list/web_state_list_order_controller.mm
deleted file mode 100644
index 38d6b5c2ef501da57bdee6ade014ed1aeeee51d8..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/web_state_list/web_state_list_order_controller.mm
+++ /dev/null
@@ -1,90 +0,0 @@
-// Copyright 2017 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/web_state_list/web_state_list_order_controller.h"
-
-#include <cstdint>
-
-#include "base/logging.h"
-#import "ios/chrome/browser/web_state_list/web_state_list.h"
-#import "ios/chrome/browser/web_state_list/web_state_opener.h"
-
-WebStateListOrderController::WebStateListOrderController(
-    WebStateList* web_state_list)
-    : web_state_list_(web_state_list) {
-  DCHECK(web_state_list_);
-}
-
-WebStateListOrderController::~WebStateListOrderController() = default;
-
-int WebStateListOrderController::DetermineInsertionIndex(
-    ui::PageTransition transition,
-    web::WebState* opener) const {
-  if (!opener)
-    return web_state_list_->count();
-
-  if (!PageTransitionCoreTypeIs(transition, ui::PAGE_TRANSITION_LINK))
-    return web_state_list_->count();
-
-  int opener_index = web_state_list_->GetIndexOfWebState(opener);
-  DCHECK_NE(WebStateList::kInvalidIndex, opener_index);
-
-  int list_child_index = web_state_list_->GetIndexOfLastWebStateOpenedBy(
-      opener, opener_index, true);
-
-  int reference_index = list_child_index != WebStateList::kInvalidIndex
-                            ? list_child_index
-                            : opener_index;
-
-  // Check for overflows (just a DCHECK as INT_MAX open WebState is unlikely).
-  DCHECK_LT(reference_index, INT_MAX);
-  return reference_index + 1;
-}
-
-int WebStateListOrderController::DetermineNewActiveIndex(
-    int removing_index) const {
-  DCHECK(web_state_list_->ContainsIndex(removing_index));
-  // First see if the index being removed has any "child" WebState. If it does,
-  // select the first WebState in that child group, not the next in the removed
-  // index group.
-  int index = web_state_list_->GetIndexOfNextWebStateOpenedBy(
-      web_state_list_->GetWebStateAt(removing_index), removing_index, false);
-
-  if (index != WebStateList::kInvalidIndex)
-    return GetValidIndex(index, removing_index);
-
-  WebStateOpener opener =
-      web_state_list_->GetOpenerOfWebStateAt(removing_index);
-  if (opener.opener) {
-    // If the WebState was in a group, shift selection to the next WebState in
-    // the group.
-    int index = web_state_list_->GetIndexOfNextWebStateOpenedBy(
-        opener.opener, removing_index, false);
-
-    if (index != WebStateList::kInvalidIndex)
-      return GetValidIndex(index, removing_index);
-
-    // If there is no subsequent group member, just fall back to opener itself.
-    index = web_state_list_->GetIndexOfWebState(opener.opener);
-    return GetValidIndex(index, removing_index);
-  }
-
-  // If this is the last WebState in the WebStateList, clear the selection.
-  if (web_state_list_->count() == 1)
-    return WebStateList::kInvalidIndex;
-
-  // No opener, fall through to the default handler, i.e. returning the previous
-  // WebState if the removed one is the last, otherwise returning the next one.
-  if (removing_index >= web_state_list_->count() - 1)
-    return removing_index - 1;
-
-  return removing_index;
-}
-
-int WebStateListOrderController::GetValidIndex(int index,
-                                               int removing_index) const {
-  if (removing_index < index)
-    return std::min(0, index - 1);
-  return index;
-}