Add LOCAL_ prefix to non-UMA histogram macros.

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 749 matching lines @@
     net_log_.EndEvent(NetLog::TYPE_HOST_RESOLVER_IMPL_PROC_TASK,
                       net_log_callback);
 
     callback_.Run(error, results_);
   }
 
   void RecordPerformanceHistograms(const base::TimeTicks& start_time,
                                    const int error,
                                    const int os_error) const {
     DCHECK(origin_loop_->BelongsToCurrentThread());
-    enum Category {  // Used in HISTOGRAM_ENUMERATION.
+    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.
 
     base::TimeDelta duration = base::TimeTicks::Now() - start_time;
     if (error == OK) {
@@ skipping 1578 matching lines @@
     dns_client_->SetConfig(dns_config);
     num_dns_failures_ = 0;
     if (dns_client_->GetConfig())
       UMA_HISTOGRAM_BOOLEAN("AsyncDNS.DnsClientEnabled", true);
   }
 
   AbortDnsTasks();
 }
 
 }  // namespace net