This patch will
* Move native print dialog code to the PrintDialogService of widget.
* Toolkit call PrintDialogService instead of calling the native print dialog.
* Change SetWindowText/CreateWindow to SetWindowTextW/CreateWindowW
in order to treat localized string correctly.
MozReview-Commit-ID: DOgp3STaJ4t
In order to move print native dialog code to windows widget, this patch will
create skeleton of PrintDialogService to windows widget.
Toolkit code(i.e. nsIPrintingPrompotService) will call this PrintDialogService.
Note that this PrintingDialogService suppose running on main process, so we
should call this interface from main process(i.e. nsPrintingPromptService, not
nsPrintingProxy).
MozReview-Commit-ID: 3P6kac9I9W4
