Remove unmapped media galleries histograms.

components/storage_monitor/media_transfer_protocol_device_observer_chromeos.cc

 // Copyright 2014 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/storage_monitor/media_transfer_protocol_device_observer_chromeos.h"
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
-#include "components/storage_monitor/media_storage_util.h"
 #include "components/storage_monitor/removable_device_constants.h"
 #include "device/media_transfer_protocol/mtp_storage_info.pb.h"
 
 namespace storage_monitor {
 
 namespace {
 
 // Device root path constant.
 const char kRootPath[] = "/";
 
@@ skipping 170 matching lines @@
   if (is_attached) {
     std::string device_id;
     base::string16 storage_label;
     std::string location;
     base::string16 vendor_name;
     base::string16 product_name;
     get_storage_info_func_(storage_name, mtp_manager_, &device_id,
                            &storage_label, &location, &vendor_name,
                            &product_name);
 
-    // Keep track of device id and device name to see how often we receive
-    // empty values.
-    MediaStorageUtil::RecordDeviceInfoHistogram(false, device_id,
-                                                storage_label);
     if (device_id.empty() || storage_label.empty())
       return;
 
     DCHECK(!base::ContainsKey(storage_map_, location));
 
     StorageInfo storage_info(device_id, location, storage_label, vendor_name,
                              product_name, 0);
     storage_map_[location] = storage_info;
     notifications_->ProcessAttach(storage_info);
   } else {
@@ skipping 24 matching lines @@
     if (it->second.device_id() == device_id) {
       *location = it->first;
       return true;
     }
   }
 
   return false;
 }
 
 }  // namespace storage_monitor