net: Cleanup class/struct forward declarations

net/tools/quic/quic_in_memory_cache.h

 // Copyright (c) 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 NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
 #define NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_
 
 #include <list>
 #include <map>
 #include <memory>
@@ skipping 16 matching lines @@
 struct DefaultSingletonTraits;
 
 }  // namespace base
 
 namespace net {
 
 namespace test {
 class QuicInMemoryCachePeer;
 }  // namespace test
 
-class QuicServer;
-
 // In-memory cache for HTTP responses.
 // Reads from disk cache generated by:
 // `wget -p --save_headers <url>`
 class QuicInMemoryCache {
  public:
   // A ServerPushInfo contains path of the push request and everything needed in
   // comprising a response for the push request.
   struct ServerPushInfo {
     ServerPushInfo(GURL request_url,
                    SpdyHeaderBlock headers,
@@ skipping 185 matching lines @@
   // Protects against concurrent access from test threads setting responses, and
   // server threads accessing those responses.
   mutable base::Lock response_mutex_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicInMemoryCache);
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_QUIC_IN_MEMORY_CACHE_H_