Initial support for HSTS certificate locking. This isn't a finished work, but

net/base/x509_cert_types.h

Index: net/base/x509_cert_types.h
===================================================================
--- net/base/x509_cert_types.h	(revision 80507)
+++ net/base/x509_cert_types.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -33,6 +33,9 @@
     return memcmp(data, other.data, sizeof(data)) == 0;
   }
 
+  // Returns the fingerprint as a lower-case hex string, e.g. a14bcd12.....
+  std::string GetString() const;
+
   unsigned char data[20];
 };