The refactoring extracts code responsible for cloning and patching
code when creating a NativeModule clone. This extraction makes it easier
to reuse the code.

Change-Id: Id4543ee07ed85c1b44472723b0bce983a97da03e
Reviewed-on: https://chromium-review.googlesource.com/975302
Commit-Queue: Kim-Anh Tran <kimanh@google.com>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52168}