Implement SHA-256 fingerprint support

net/base/multi_threaded_cert_verifier.h

Index: net/base/multi_threaded_cert_verifier.h
===================================================================
--- net/base/multi_threaded_cert_verifier.h	(revision 152095)
+++ net/base/multi_threaded_cert_verifier.h	(working copy)
@@ -66,8 +66,8 @@
 
   // Input parameters of a certificate verification request.
   struct NET_EXPORT_PRIVATE RequestParams {
-    RequestParams(const SHA1Fingerprint& cert_fingerprint_arg,
-                  const SHA1Fingerprint& ca_fingerprint_arg,
+    RequestParams(const SHA1HashValue& cert_fingerprint_arg,
+                  const SHA1HashValue& ca_fingerprint_arg,
                   const std::string& hostname_arg,
                   int flags_arg);
 
@@ -88,8 +88,8 @@
       return hostname < other.hostname;
     }
 
-    SHA1Fingerprint cert_fingerprint;
-    SHA1Fingerprint ca_fingerprint;
+    SHA1HashValue cert_fingerprint;
+    SHA1HashValue ca_fingerprint;
     std::string hostname;
     int flags;
   };