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

ios/chrome/browser/web_state_list/web_state_list_observer_bridge.mm

Index: ios/chrome/browser/web_state_list/web_state_list_observer_bridge.mm
diff --git a/ios/chrome/browser/web_state_list/web_state_list_observer_bridge.mm b/ios/chrome/browser/web_state_list/web_state_list_observer_bridge.mm
deleted file mode 100644
index af9d0efb48fd9f19a111f965fb5a81aecdfbcc08..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/web_state_list/web_state_list_observer_bridge.mm
+++ /dev/null
@@ -1,116 +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_observer_bridge.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-WebStateListObserverBridge::WebStateListObserverBridge(
-    id<WebStateListObserving> observer)
-    : observer_(observer) {}
-
-WebStateListObserverBridge::~WebStateListObserverBridge() {}
-
-void WebStateListObserverBridge::WebStateInsertedAt(
-    WebStateList* web_state_list,
-    web::WebState* web_state,
-    int index) {
-  const SEL selector = @selector(webStateList:didInsertWebState:atIndex:);
-  if (![observer_ respondsToSelector:selector])
-    return;
-
-  [observer_ webStateList:web_state_list
-        didInsertWebState:web_state
-                  atIndex:index];
-}
-
-void WebStateListObserverBridge::WebStateMoved(WebStateList* web_state_list,
-                                               web::WebState* web_state,
-                                               int from_index,
-                                               int to_index) {
-  const SEL selector =
-      @selector(webStateList:didMoveWebState:fromIndex:toIndex:);
-  if (![observer_ respondsToSelector:selector])
-    return;
-
-  [observer_ webStateList:web_state_list
-          didMoveWebState:web_state
-                fromIndex:from_index
-                  toIndex:to_index];
-}
-
-void WebStateListObserverBridge::WebStateReplacedAt(
-    WebStateList* web_state_list,
-    web::WebState* old_web_state,
-    web::WebState* new_web_state,
-    int index) {
-  const SEL selector =
-      @selector(webStateList:didReplaceWebState:withWebState:atIndex:);
-  if (![observer_ respondsToSelector:selector])
-    return;
-
-  [observer_ webStateList:web_state_list
-       didReplaceWebState:old_web_state
-             withWebState:new_web_state
-                  atIndex:index];
-}
-
-void WebStateListObserverBridge::WillDetachWebStateAt(
-    WebStateList* web_state_list,
-    web::WebState* web_state,
-    int index) {
-  const SEL selector = @selector(webStateList:willDetachWebState:atIndex:);
-  if (![observer_ respondsToSelector:selector])
-    return;
-
-  [observer_ webStateList:web_state_list
-       willDetachWebState:web_state
-                  atIndex:index];
-}
-
-void WebStateListObserverBridge::WebStateDetachedAt(
-    WebStateList* web_state_list,
-    web::WebState* web_state,
-    int index) {
-  const SEL selector = @selector(webStateList:didDetachWebState:atIndex:);
-  if (![observer_ respondsToSelector:selector])
-    return;
-
-  [observer_ webStateList:web_state_list
-        didDetachWebState:web_state
-                  atIndex:index];
-}
-
-void WebStateListObserverBridge::WillCloseWebStateAt(
-    WebStateList* web_state_list,
-    web::WebState* web_state,
-    int index) {
-  const SEL selector = @selector(webStateList:willCloseWebState:atIndex:);
-  if (![observer_ respondsToSelector:selector])
-    return;
-
-  [observer_ webStateList:web_state_list
-        willCloseWebState:web_state
-                  atIndex:index];
-}
-
-void WebStateListObserverBridge::WebStateActivatedAt(
-    WebStateList* web_state_list,
-    web::WebState* old_web_state,
-    web::WebState* new_web_state,
-    int active_index,
-    bool user_action) {
-  const SEL selector = @selector
-      (webStateList:didChangeActiveWebState:oldWebState:atIndex:userAction:);
-  if (![observer_ respondsToSelector:selector])
-    return;
-
-  [observer_ webStateList:web_state_list
-      didChangeActiveWebState:new_web_state
-                  oldWebState:old_web_state
-                      atIndex:active_index
-                   userAction:(user_action ? YES : NO)];
-}