Fix the number of buckets in Net.Wifi.InterfaceCount UMA histogram.

content/browser/geolocation/wifi_data_provider_corewlan_mac.mm

 // Copyright (c) 2011 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.
 
 // Implements a WLAN API binding for CoreWLAN, as available on OSX 10.6
 
 #include "content/browser/geolocation/wifi_data_provider_mac.h"
 
 #include <dlfcn.h>
 #import <Foundation/Foundation.h>
@@ skipping 150 matching lines @@
       access_point_data.ssid = base::SysNSStringToUTF16([network ssid]);
       data->insert(access_point_data);
     }
   }
 
   UMA_HISTOGRAM_CUSTOM_COUNTS(
       "Net.Wifi.InterfaceCount",
       [supported_interfaces count] - interface_error_count,
       1,
       5,
-      5);
+      6);
 
   // Return true even if some interfaces failed to scan, so long as at least
   // one interface did not fail.
   return interface_error_count == 0 ||
          [supported_interfaces count] > interface_error_count;
 }
 
 WifiDataProviderCommon::WlanApiInterface* NewCoreWlanApi() {
   scoped_ptr<CoreWlanApi> self(new CoreWlanApi);
   if (self->Init())
     return self.release();
 
   return NULL;
 }
 
 }  // namespace content