Move TransportSecurityPersister completely to IO thread.

net/base/transport_security_state.h

 // Copyright (c) 2011 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_BASE_TRANSPORT_SECURITY_STATE_H_
 #define NET_BASE_TRANSPORT_SECURITY_STATE_H_
 #pragma once
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "net/base/net_export.h"
 #include "net/base/x509_cert_types.h"
 
 namespace net {
 
 // TransportSecurityState
 //
 // Tracks which hosts have enabled *-Transport-Security. This object manages
 // the in-memory store. A separate object must register itself with this object
 // in order to persist the state to disk.
+//
+// TODO(phajdan.jr): Convert this to non-thread-safe non-ref-counted
+// for simplicity.
 class NET_EXPORT TransportSecurityState :
     public base::RefCountedThreadSafe<TransportSecurityState> {
  public:
   // If non-empty, |hsts_hosts| is a JSON-formatted string to treat as if it
   // were a built-in entry (same format as persisted metadata in the
   // TransportSecurityState file).
   explicit TransportSecurityState(const std::string& hsts_hosts);
 
   // A DomainState is the information that we persist about a given domain.
   struct NET_EXPORT DomainState {
@@ skipping 132 matching lines @@
 
   // Our delegate who gets notified when we are dirtied, or NULL.
   Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TransportSecurityState);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_TRANSPORT_SECURITY_STATE_H_