Revert of Use ChromeBrowserStateManager instead of BrowserListIOS.

ios/chrome/browser/ui/browser_ios.h

+// Copyright 2012 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_UI_BROWSER_IOS_H_
+#define IOS_CHROME_BROWSER_UI_BROWSER_IOS_H_
+
+#import <Foundation/Foundation.h>
+
+namespace ios {
+class ChromeBrowserState;
+}
+
+@class TabModel;
+
+// Modeled after chrome/browser/ui/browser, just an abstract interface to
+// a browser to get the browser state and tabs from but can go into a
+// BrowserListIOS.
+@protocol BrowserIOS
+
+- (ios::ChromeBrowserState*)browserState;
+- (TabModel*)tabModel;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_BROWSER_IOS_H_