net: Cleanup class/struct forward declarations

net/cert/internal/trust_store_collection.h

 // Copyright 2016 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 NET_CERT_INTERNAL_TRUST_STORE_COLLECTION_H_
 #define NET_CERT_INTERNAL_TRUST_STORE_COLLECTION_H_
 
 #include "base/memory/ref_counted.h"
 #include "net/base/net_export.h"
 #include "net/cert/internal/trust_store.h"
 
-namespace base {
-class TaskRunner;
-}
-
 namespace net {
 
 // TrustStoreCollection is an implementation of TrustStore which combines the
 // results from multiple TrustStores.
 //
 // The order of the matches will correspond to a concatenation of matches in
 // the order the stores were added.
 class NET_EXPORT TrustStoreCollection : public TrustStore {
  public:
   TrustStoreCollection();
   ~TrustStoreCollection() override;
 
   // Includes results from |store| in the combined output. |store| must
   // outlive the TrustStoreCollection.
   void AddTrustStore(TrustStore* store);
 
   // TrustStore implementation:
   void FindTrustAnchorsForCert(const scoped_refptr<ParsedCertificate>& cert,
                                TrustAnchors* matches) const override;
 
  private:
   std::vector<TrustStore*> stores_;
 
   DISALLOW_COPY_AND_ASSIGN(TrustStoreCollection);
 };
 
 }  // namespace net
 
 #endif  // NET_CERT_INTERNAL_TRUST_STORE_COLLECTION_H_