Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

net/dns/host_resolver_impl.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/dns/host_resolver_impl.h"
 
 #if defined(OS_WIN)
 #include <Winsock2.h>
 #elif defined(OS_POSIX)
 #include <netdb.h>
@@ skipping 862 matching lines @@
                                    const int error,
                                    const int os_error) const {
     DCHECK(network_task_runner_->BelongsToCurrentThread());
     enum Category {  // Used in UMA_HISTOGRAM_ENUMERATION.
       RESOLVE_SUCCESS,
       RESOLVE_FAIL,
       RESOLVE_SPECULATIVE_SUCCESS,
       RESOLVE_SPECULATIVE_FAIL,
       RESOLVE_MAX,  // Bounding value.
     };
-    int category = RESOLVE_MAX;  // Illegal value for later DCHECK only.
+    Category category = RESOLVE_MAX;  // Illegal value for later DCHECK only.
 
     base::TimeDelta duration = base::TimeTicks::Now() - start_time;
     if (error == OK) {
       if (had_non_speculative_request_) {
         category = RESOLVE_SUCCESS;
         DNS_HISTOGRAM("DNS.ResolveSuccess", duration);
       } else {
         category = RESOLVE_SPECULATIVE_SUCCESS;
         DNS_HISTOGRAM("DNS.ResolveSpeculativeSuccess", duration);
       }
@@ skipping 1805 matching lines @@
   if (job_)
     job_->CancelRequest(this);
 }
 
 void HostResolverImpl::RequestImpl::ChangeRequestPriority(
     RequestPriority priority) {
   job_->ChangeRequestPriority(this, priority);
 }
 
 }  // namespace net