Remove unnecessary const from HttpAuthCache to appease the clang gods.

net/http/http_auth_cache.h

 // Copyright (c) 2010 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_HTTP_AUTH_CACHE_H_
 #define NET_HTTP_HTTP_AUTH_CACHE_H_
 #pragma once
 
 #include <list>
 #include <string>
@@ skipping 104 matching lines @@
   const GURL& origin() const {
     return origin_;
   }
 
   // The case-sensitive realm string of the challenge.
   const std::string realm() const {
     return realm_;
   }
 
   // The authentication scheme of the challenge.
-  const HttpAuth::Scheme scheme() const {
+  HttpAuth::Scheme scheme() const {
     return scheme_;
   }
 
   // The authentication challenge.
   const std::string auth_challenge() const {
     return auth_challenge_;
   }
 
   // The login username.
   const string16 username() const {
@@ skipping 39 matching lines @@
 
   int nonce_count_;
 
   // List of paths that define the realm's protection space.
   PathList paths_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_CACHE_H_