Revert 150124 - Implement SHA-256 fingerprint support.

net/base/ssl_info.h

Index: net/base/ssl_info.h
===================================================================
--- net/base/ssl_info.h	(revision 150163)
+++ net/base/ssl_info.h	(working copy)
@@ -71,11 +71,8 @@
 
   HandshakeType handshake_type;
 
-  // The hashes of the SubjectPublicKeyInfos from each certificate in the
-  // chain. This is a vector of vectors: Index the outer vector with
-  // FingerprintTag, and then the inner HashValueVectors will be
-  // fingerprints made with the algorithm named by the FingerprintTag.
-  std::vector<HashValueVector> public_key_hashes;
+  // The hashes of the SubjectPublicKeyInfos from each certificate in the chain.
+  std::vector<SHA1Fingerprint> public_key_hashes;
 };
 
 }  // namespace net