Fix UnindexedRulesetWriter finishing.

components/subresource_filter/core/browser/ruleset_service.cc

 // Copyright 2016 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/subresource_filter/core/browser/ruleset_service.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 206 matching lines @@
       if (!indexer->AddUrlRule(rule))
         ++num_unsupported_rules;
     }
   }
   indexer->Finish();
 
   UMA_HISTOGRAM_COUNTS_10000(
       "SubresourceFilter.IndexRuleset.NumUnsupportedRules",
       num_unsupported_rules);
 
-  return zero_copy_stream_adaptor.ByteCount() == unindexed_ruleset_size;
+  return reader.num_bytes_read() == unindexed_ruleset_size;
 }
 
 // static
 RulesetService::IndexAndWriteRulesetResult RulesetService::WriteRuleset(
     const base::FilePath& indexed_ruleset_base_dir,
     const IndexedRulesetVersion& indexed_version,
     const base::FilePath& license_path,
     const uint8_t* indexed_ruleset_data,
     size_t indexed_ruleset_size) {
   base::FilePath indexed_ruleset_version_dir =
@@ skipping 101 matching lines @@
   DCHECK(ruleset_data_);
   if (!ruleset_data_->IsValid())
     return;
 
   DCHECK_EQ(error, base::File::Error::FILE_OK);
   for (auto& distributor : distributors_)
     distributor->PublishNewVersion(ruleset_data_->DuplicateFile());
 }
 
 }  // namespace subresource_filter