Remove the code to store and load QUIC server configs in the disk cache.

net/http/disk_cache_based_quic_server_info.h

-// Copyright 2014 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_HTTP_DISK_CACHE_BASED_QUIC_SERVER_INFO_H_
-#define NET_HTTP_DISK_CACHE_BASED_QUIC_SERVER_INFO_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
-#include "base/time/time.h"
-#include "net/base/completion_callback.h"
-#include "net/base/net_export.h"
-#include "net/disk_cache/disk_cache.h"
-#include "net/quic/chromium/quic_server_info.h"
-
-namespace net {
-
-class HttpCache;
-class IOBufferWithSize;
-class QuicServerId;
-
-// DiskCacheBasedQuicServerInfo fetches information about a QUIC server from
-// our standard disk cache. Since the information is defined to be
-// non-sensitive, it's ok for us to keep it on disk.
-class NET_EXPORT_PRIVATE DiskCacheBasedQuicServerInfo
-    : public QuicServerInfo,
-      public NON_EXPORTED_BASE(base::NonThreadSafe) {
- public:
-  DiskCacheBasedQuicServerInfo(const QuicServerId& server_id,
-                               HttpCache* http_cache);
-  ~DiskCacheBasedQuicServerInfo() override;
-
-  // QuicServerInfo implementation.
-  void Start() override;
-  int WaitForDataReady(const CompletionCallback& callback) override;
-  void ResetWaitForDataReadyCallback() override;
-  void CancelWaitForDataReadyCallback() override;
-  bool IsDataReady() override;
-  bool IsReadyToPersist() override;
-  void Persist() override;
-  void OnExternalCacheHit() override;
-  size_t EstimateMemoryUsage() const override;
-
- private:
-  struct CacheOperationDataShim;
-
-  enum State {
-    GET_BACKEND,
-    GET_BACKEND_COMPLETE,
-    OPEN,
-    OPEN_COMPLETE,
-    READ,
-    READ_COMPLETE,
-    WAIT_FOR_DATA_READY_DONE,
-    CREATE_OR_OPEN,
-    CREATE_OR_OPEN_COMPLETE,
-    WRITE,
-    WRITE_COMPLETE,
-    SET_DONE,
-    NONE,
-  };
-
-  // Persists |pending_write_data_| if it is not empty, otherwise serializes the
-  // data and pesists it.
-  void PersistInternal();
-
-  std::string key() const;
-
-  // The |unused| parameter is a small hack so that we can have the
-  // CacheOperationDataShim object owned by the Callback that is created for
-  // this method.  See comment above CacheOperationDataShim for details.
-  void OnIOComplete(CacheOperationDataShim* unused, int rv);
-
-  int DoLoop(int rv);
-
-  int DoGetBackendComplete(int rv);
-  int DoOpenComplete(int rv);
-  int DoReadComplete(int rv);
-  int DoWriteComplete(int rv);
-  int DoCreateOrOpenComplete(int rv);
-
-  int DoGetBackend();
-  int DoOpen();
-  int DoRead();
-  int DoWrite();
-  int DoCreateOrOpen();
-
-  // DoWaitForDataReadyDone is the terminal state of the read operation.
-  int DoWaitForDataReadyDone();
-
-  // DoSetDone is the terminal state of the write operation.
-  int DoSetDone();
-
-  // Tracks in a histogram the number of times data read/parse/write API calls
-  // of QuicServerInfo to and from disk cache is called.
-  void RecordQuicServerInfoStatus(QuicServerInfoAPICall call);
-
-  // Tracks in a histogram the failure reasons to read/load/write of
-  // QuicServerInfo to and from disk cache. It also saves the |failure| in
-  // |last_failure_|.
-  void RecordQuicServerInfoFailure(FailureReason failure);
-
-  // Tracks in a histogram if |last_failure_| is not NO_FAILURE.
-  void RecordLastFailure();
-
-  CacheOperationDataShim* data_shim_;  // Owned by |io_callback_|.
-  CompletionCallback io_callback_;
-  State state_;
-  bool ready_;
-  bool found_entry_;  // Controls the behavior of DoCreateOrOpen.
-  std::string new_data_;
-  std::string pending_write_data_;
-  const QuicServerId server_id_;
-  HttpCache* const http_cache_;
-  disk_cache::Backend* backend_;
-  disk_cache::Entry* entry_;
-  CompletionCallback wait_for_ready_callback_;
-  scoped_refptr<IOBufferWithSize> read_buffer_;
-  scoped_refptr<IOBufferWithSize> write_buffer_;
-  std::string data_;
-  base::TimeTicks load_start_time_;
-  FailureReason last_failure_;
-
-  base::WeakPtrFactory<DiskCacheBasedQuicServerInfo> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(DiskCacheBasedQuicServerInfo);
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP_DISK_CACHE_BASED_QUIC_SERVER_INFO_H_