Fix up certificate error reporting histograms

net/http/transport_security_state.cc

 // Copyright (c) 2012 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.
 
 #include "net/http/transport_security_state.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 51 matching lines @@
     return memcmp(lhs.data, rhs.data(), rhs.size()) < 0;
   }
 
   bool operator()(const HashValue& lhs, const SHA256HashValue& rhs) const {
     DCHECK_EQ(HASH_VALUE_SHA256, lhs.tag);
     return memcmp(lhs.data(), rhs.data, lhs.size()) < 0;
   }
 };
 
 void RecordUMAForHPKPReportFailure(const GURL& report_uri, int net_error) {
-  UMA_HISTOGRAM_SPARSE_SLOWLY("Net.PublicKeyPinReportSendingFailure",
-                              net_error);
+  UMA_HISTOGRAM_SPARSE_SLOWLY("Net.PublicKeyPinReportSendingFailure2",
+                              -net_error);
 }
 
 std::string TimeToISO8601(const base::Time& t) {
   base::Time::Exploded exploded;
   t.UTCExplode(&exploded);
   return base::StringPrintf(
       "%04d-%02d-%02dT%02d:%02d:%02d.%03dZ", exploded.year, exploded.month,
       exploded.day_of_month, exploded.hour, exploded.minute, exploded.second,
       exploded.millisecond);
 }
@@ skipping 1437 matching lines @@
 TransportSecurityState::PKPStateIterator::PKPStateIterator(
     const TransportSecurityState& state)
     : iterator_(state.enabled_pkp_hosts_.begin()),
       end_(state.enabled_pkp_hosts_.end()) {
 }
 
 TransportSecurityState::PKPStateIterator::~PKPStateIterator() {
 }
 
 }  // namespace