Certificate Transparency: Ensure timestamps over 32 bit are handled correctly.

net/cert/signed_tree_head.cc

Index: net/cert/signed_tree_head.cc
diff --git a/net/cert/signed_tree_head.cc b/net/cert/signed_tree_head.cc
index ef1ab708c7c9e18c5f938e58368ae3a66b719a7d..00fc1342d65a61825446d6d8542d170e8a21724e 100644
--- a/net/cert/signed_tree_head.cc
+++ b/net/cert/signed_tree_head.cc
@@ -6,6 +6,8 @@
 
 #include <string.h>
 
+#include <iostream>
+
 #include "base/strings/string_number_conversions.h"
 
 namespace net {
@@ -29,17 +31,16 @@ SignedTreeHead::SignedTreeHead(Version version,
 
 SignedTreeHead::~SignedTreeHead() {}
 
-std::ostream& operator<<(std::ostream& stream, const SignedTreeHead& sth) {
-  return stream << "{\n"
-                << "\t\"version\": " << sth.version << ",\n"
-                << "\t\"timestamp\": " << sth.timestamp << ",\n"
-                << "\t\"tree_size\": " << sth.tree_size << ",\n"
-                << "\t\"sha256_root_hash\": \""
-                << base::HexEncode(sth.sha256_root_hash, kSthRootHashLength)
-                << "\",\n\t\"log_id\": \""
-                << base::HexEncode(sth.log_id.data(), sth.log_id.size())
-                << "\"\n"
-                << "}";
+void PrintTo(const SignedTreeHead& sth, std::ostream* os) {
+  (*os) << "{\n"
+        << "\t\"version\": " << sth.version << ",\n"
+        << "\t\"timestamp\": " << sth.timestamp << ",\n"
+        << "\t\"tree_size\": " << sth.tree_size << ",\n"
+        << "\t\"sha256_root_hash\": \""
+        << base::HexEncode(sth.sha256_root_hash, kSthRootHashLength)
+        << "\",\n\t\"log_id\": \""
+        << base::HexEncode(sth.log_id.data(), sth.log_id.size()) << "\"\n"
+        << "}";
 }
 
 }  // namespace ct