Add Worker support for FileSystem API.

webkit/fileapi/file_system_operation_unittest.cc

Index: webkit/fileapi/file_system_operation_unittest.cc
diff --git a/webkit/fileapi/file_system_operation_unittest.cc b/webkit/fileapi/file_system_operation_unittest.cc
index 1d0855cf6a53310da139a7a0de223204116d2305..93680a04af87963f0037bcc6ee2c4ccdf3cace38 100644
--- a/webkit/fileapi/file_system_operation_unittest.cc
+++ b/webkit/fileapi/file_system_operation_unittest.cc
@@ -48,7 +48,7 @@ class MockDispatcher : public fileapi::FileSystemCallbackDispatcher {
     entries_ = entries;
   }
 
-  virtual void DidOpenFileSystem(const string16&, const FilePath&) {
+  virtual void DidOpenFileSystem(const std::string&, const FilePath&) {
     NOTREACHED();
   }