Not creating ClientUsageTracker for unsupported storage type.

webkit/browser/fileapi/file_system_quota_client.cc

Index: webkit/browser/fileapi/file_system_quota_client.cc
diff --git a/webkit/browser/fileapi/file_system_quota_client.cc b/webkit/browser/fileapi/file_system_quota_client.cc
index 343a6e6ee5c7d90941c1a4da840990d1ad092b01..76725df31a84864defa49368f2b64e9a6a02b21f 100644
--- a/webkit/browser/fileapi/file_system_quota_client.cc
+++ b/webkit/browser/fileapi/file_system_quota_client.cc
@@ -197,6 +197,12 @@ void FileSystemQuotaClient::DeleteOriginData(
       callback);
 }
 
+bool FileSystemQuotaClient::DoesSupport(quota::StorageType storage_type) const {
+  FileSystemType type = QuotaStorageTypeToFileSystemType(storage_type);
+  DCHECK(type != kFileSystemTypeUnknown);
+  return file_system_context_->IsSandboxFileSystem(type);
+}
+
 base::SequencedTaskRunner* FileSystemQuotaClient::file_task_runner() const {
   return file_system_context_->default_file_task_runner();
 }