Remove base::NonThreadSafe now that all users are gone!!

content/public/browser/ssl_host_state_delegate.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 CONTENT_PUBLIC_BROWSER_SSL_HOST_STATE_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_SSL_HOST_STATE_DELEGATE_H_
 
 #include <memory>
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
 #include "content/common/content_export.h"
 #include "net/cert/x509_certificate.h"
 
 namespace content {
 
 // The SSLHostStateDelegate encapulates the host-specific state for SSL errors.
 // For example, SSLHostStateDelegate remembers whether the user has whitelisted
 // a particular broken cert for use with particular host.  We separate this
 // state from the SSLManager because this state is shared across many navigation
 // controllers.
@@ skipping 59 matching lines @@
   // error combination exception is allowed, use QueryPolicy().
   virtual bool HasAllowException(const std::string& host) const = 0;
 
  protected:
   virtual ~SSLHostStateDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SSL_HOST_STATE_DELEGATE_H_