ios: Cleanup class/struct forward declarations

ios/public/provider/chrome/browser/chrome_browser_provider.h

 // Copyright 2013 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_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_
 #define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_
 
 #include <CoreGraphics/CoreGraphics.h>
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "components/favicon_base/favicon_callback.h"
 
 class AppDistributionProvider;
-class AutocompleteProvider;
 class BrandedImageProvider;
 class GURL;
 class InfoBarViewDelegate;
 class OmahaServiceProvider;
-class PrefRegistrySimple;
 class PrefService;
 class SpotlightProvider;
 class UserFeedbackProvider;
 class VoiceSearchProvider;
 
 namespace autofill {
 class CardUnmaskPromptController;
 class CardUnmaskPromptView;
 }
 
-namespace net {
-class URLRequestContextGetter;
-}
-
 namespace web {
 class WebState;
 }
 
 namespace sync_sessions {
 class SyncedWindowDelegatesGetter;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
@@ skipping 143 matching lines @@
   // not dismiss them.
   virtual void LogIfModalViewsArePresented() const;
 
   // Returns an instance of the spotlight provider.
   virtual SpotlightProvider* GetSpotlightProvider() const;
 };
 
 }  // namespace ios
 
 #endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_