Convert Pass()→std::move() in //chrome (Android edition)

chrome/browser/android/history_report/delta_file_backend_leveldb.cc

 // Copyright 2015 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 "chrome/browser/android/history_report/delta_file_backend_leveldb.h"
 
 #include <inttypes.h>
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 192 matching lines @@
       new std::vector<DeltaFileEntryWithData>());
   int32_t count = 0;
   for (db_it->Seek(start); db_it->Valid() && count < limit; db_it->Next()) {
     DeltaFileEntry entry;
     leveldb::Slice value_slice = db_it->value();
     if (!entry.ParseFromArray(value_slice.data(), value_slice.size()))
       continue;
     result->push_back(DeltaFileEntryWithData(entry));
     ++count;
   }
-  return result.Pass();
+  return result;
 }
 
 void DeltaFileBackend::Clear() {
   if (!EnsureInitialized()) return;
   db_.reset();
   base::DeleteFile(path_, true);
   Init();
 }
 
 std::string DeltaFileBackend::Dump() {
   std::string dump("\n Delta File [");
   if (!EnsureInitialized()) {
     dump.append("not initialized]");
     return dump;
   }
   dump.append("num pending entries=");
   leveldb::ReadOptions options;
   scoped_ptr<leveldb::Iterator> db_it(db_->NewIterator(options));
   int num_entries = 0;
   for (db_it->SeekToFirst(); db_it->Valid(); db_it->Next()) num_entries++;
   dump.append(base::IntToString(num_entries));
   dump.append("]");
   return dump;
 }
 
 }  // namespace history_report