Use ChromeBrowserStateManager instead of BrowserListIOS.

ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.h

 // Copyright 2015 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.
 
 #ifndef IOS_CHROME_BROWSER_TABS_TAB_MODEL_SYNCED_WINDOW_DELEGATE_GETTER_H_
 #define IOS_CHROME_BROWSER_TABS_TAB_MODEL_SYNCED_WINDOW_DELEGATE_GETTER_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "components/sessions/core/session_id.h"
 #include "components/sync_sessions/synced_window_delegates_getter.h"
 
 namespace browser_sync {
 class SyncedWindowDelegate;
 }
 
-namespace ios {
-class ChromeBrowserState;
-}
-
 class TabModelSyncedWindowDelegatesGetter
     : public sync_sessions::SyncedWindowDelegatesGetter {
  public:
-  // TODO(crbug.com/548612): |browser_state| may be unnecessary as iOS does not
-  // supports multi-profile starting with M47. Should it be removed?
-  explicit TabModelSyncedWindowDelegatesGetter(
-      ios::ChromeBrowserState* browser_state);
+  TabModelSyncedWindowDelegatesGetter();
   ~TabModelSyncedWindowDelegatesGetter() override;
 
   // sync_sessions::SyncedWindowDelegatesGetter:
   std::set<const sync_sessions::SyncedWindowDelegate*>
   GetSyncedWindowDelegates() override;
   const sync_sessions::SyncedWindowDelegate* FindById(
-      SessionID::id_type id) override;
+      SessionID::id_type session_id) override;
 
  private:
-  const ios::ChromeBrowserState* const browser_state_;
-
   DISALLOW_COPY_AND_ASSIGN(TabModelSyncedWindowDelegatesGetter);
 };
 
 #endif  // IOS_CHROME_BROWSER_TABS_TAB_MODEL_SYNCED_WINDOW_DELEGATE_GETTER_H_