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 synchronous matches will be in order from the primary store, and then
 // from the secondary stores in the order they were added to the
 // TrustStoreCollection.
 //
 // Currently only one "primary" store can be added that supports async queries,
@@ skipping 27 matching lines @@
  private:
   TrustStore* primary_store_ = nullptr;
   std::vector<TrustStore*> sync_only_stores_;
 
   DISALLOW_COPY_AND_ASSIGN(TrustStoreCollection);
 };
 
 }  // namespace net
 
 #endif  // NET_CERT_INTERNAL_TRUST_STORE_COLLECTION_H_