[BlobStorage] Fix UMA reporting.

storage/browser/blob/blob_storage_context.cc

 // Copyright (c) 2013 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 "storage/browser/blob/blob_storage_context.h"
 
 #include <algorithm>
 #include <limits>
 #include <memory>
 #include <set>
@@ skipping 279 matching lines @@
       }
       case DataElement::TYPE_FILE: {
         UMA_HISTOGRAM_COUNTS("Storage.BlobItemSize.BlobSlice.File",
                              read_size / 1024);
         std::unique_ptr<DataElement> element(new DataElement());
         element->SetToFilePathRange(
             source_item->path(), source_item->offset() + item_offset, read_size,
             source_item->expected_modification_time());
         data_item =
             new BlobDataItem(std::move(element), source_item->data_handle_);
-        UMA_HISTOGRAM_COUNTS("Storage.BlobItemSize.BlobSlice.Bytes",
-                             read_size / 1024);
 
         DCHECK(!BlobDataBuilder::IsFutureFileItem(source_item->data_element()))
             << "File allocation unimplemented.";
         break;
       }
       case DataElement::TYPE_FILE_FILESYSTEM: {
         UMA_HISTOGRAM_COUNTS("Storage.BlobItemSize.BlobSlice.FileSystem",
                              read_size / 1024);
         std::unique_ptr<DataElement> element(new DataElement());
         element->SetToFileSystemUrlRange(
             source_item->filesystem_url(), source_item->offset() + item_offset,
             read_size, source_item->expected_modification_time());
         data_item = new BlobDataItem(std::move(element));
         break;
       }
       case DataElement::TYPE_DISK_CACHE_ENTRY: {
+        UMA_HISTOGRAM_COUNTS("Storage.BlobItemSize.BlobSlice.CacheEntry",
+                             read_size / 1024);
         std::unique_ptr<DataElement> element(new DataElement());
         element->SetToDiskCacheEntryRange(source_item->offset() + item_offset,
                                           read_size);
         data_item =
             new BlobDataItem(std::move(element), source_item->data_handle_,
                              source_item->disk_cache_entry(),
                              source_item->disk_cache_stream_index(),
                              source_item->disk_cache_side_stream_index());
         break;
       }
@@ skipping 393 matching lines @@
     if (building_state->memory_quota_request) {
       building_state->memory_quota_request->Cancel();
     }
   }
   entry->ClearItems();
   entry->ClearOffsets();
   entry->set_size(0);
 }
 
 }  // namespace storage