Fix remaining incompatibilities between scoped_ptr and unique_ptr.

components/drive/resource_metadata_storage.cc

 // Copyright 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 "components/drive/resource_metadata_storage.h"
 
 #include <stddef.h>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 612 matching lines @@
       }
     } else {
       LOG(ERROR) << "Failed to create resource map DB: " << status.ToString();
       init_result = LevelDBStatusToDBInitStatus(status);
     }
   }
 
   UMA_HISTOGRAM_ENUMERATION("Drive.MetadataDBInitResult",
                             init_result,
                             DB_INIT_MAX_VALUE);
-  return resource_map_;
+  return !!resource_map_;
 }
 
 void ResourceMetadataStorage::RecoverCacheInfoFromTrashedResourceMap(
     RecoveredCacheInfoMap* out_info) {
   const base::FilePath trashed_resource_map_path =
       directory_path_.Append(kTrashedResourceMapDBName);
 
   if (!base::PathExists(trashed_resource_map_path))
     return;
 
@@ skipping 414 matching lines @@
     RecordCheckValidityFailure(
         CHECK_VALIDITY_FAILURE_CHILD_ENTRY_COUNT_MISMATCH);
     return false;
   }
 
   return true;
 }
 
 }  // namespace internal
 }  // namespace drive