password_manager bad_message.h: Use a sparse histogram.

components/password_manager/content/browser/bad_message.cc

 // Copyright 2015 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 "components/password_manager/content/browser/bad_message.h"
 
 #include "base/logging.h"
-#include "base/metrics/histogram_macros.h"
+#include "base/metrics/sparse_histogram.h"
 #include "content/public/browser/render_process_host.h"
 
 namespace password_manager {
 namespace bad_message {
 
 void ReceivedBadMessage(content::RenderProcessHost* host,
                         BadMessageReason reason) {
   LOG(ERROR)
       << "Terminating renderer for bad PasswordManager IPC message, reason "
       << static_cast<int>(reason);
-  UMA_HISTOGRAM_ENUMERATION(
-      "Stability.BadMessageTerminated.PasswordManager",
-      static_cast<int>(reason),
-      static_cast<int>(BadMessageReason::BAD_MESSAGE_MAX));
+  UMA_HISTOGRAM_SPARSE_SLOWLY("Stability.BadMessageTerminated.PasswordManager",
+                              static_cast<int>(reason));
   host->ShutdownForBadMessage();
 }
 
 }  // namespace bad_message
 }  // namespace password_manager