Make indexed_db.mojom.BlobInfo.size a signed integer.

content/browser/indexed_db/database_impl.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 "content/browser/indexed_db/database_impl.h"
 
 #include "content/browser/bad_message.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/indexed_db/indexed_db_connection.h"
 #include "content/browser/indexed_db/indexed_db_context_impl.h"
@@ skipping 262 matching lines @@
 
     if (info->file) {
       if (!info->file->path.empty() &&
           !policy->CanReadFile(dispatcher_host_->ipc_process_id(),
                                info->file->path)) {
         mojo::ReportBadMessage(kInvalidBlobFilePath);
         return;
       }
       blob_info[i] = IndexedDBBlobInfo(info->uuid, info->file->path,
                                        info->file->name, info->mime_type);
-      if (info->size != static_cast<uint64_t>(-1)) {
+      if (info->size != -1) {
         blob_info[i].set_last_modified(info->file->last_modified);
         blob_info[i].set_size(info->size);
       }
     } else {
       blob_info[i] = IndexedDBBlobInfo(info->uuid, info->mime_type, info->size);
     }
   }
 
   scoped_refptr<IndexedDBCallbacks> callbacks(new IndexedDBCallbacks(
       dispatcher_host_.get(), origin_, std::move(callbacks_info)));
@@ skipping 479 matching lines @@
   if (status == storage::kQuotaStatusOk && usage + transaction_size <= quota) {
     connection_->database()->Commit(host_transaction_id);
   } else {
     connection_->database()->Abort(
         host_transaction_id,
         IndexedDBDatabaseError(blink::WebIDBDatabaseExceptionQuotaError));
   }
 }
 
 }  // namespace content