More FWL interface cleanup.

xfa.gyp

Index: xfa.gyp
diff --git a/xfa.gyp b/xfa.gyp
index f3781a044a6b99883a2c499cfe54aa227f394989..541e37e8a1ca9f88ef4a7ad05cc87c6cdcdd10cd 100644
--- a/xfa.gyp
+++ b/xfa.gyp
@@ -187,10 +187,6 @@
         "xfa/fwl/core/fwl_noteimp.h",
         "xfa/fwl/core/fwl_sdadapterimp.cpp",
         "xfa/fwl/core/fwl_sdadapterimp.h",
-        "xfa/fwl/core/fwl_targetimp.cpp",
-        "xfa/fwl/core/fwl_targetimp.h",
-        "xfa/fwl/core/fwl_threadimp.cpp",
-        "xfa/fwl/core/fwl_threadimp.h",
         "xfa/fwl/core/fwl_timerimp.cpp",
         "xfa/fwl/core/fwl_widgetdef.h",
         "xfa/fwl/core/fwl_widgetimp.cpp",
@@ -203,17 +199,12 @@
         "xfa/fwl/core/ifwl_app.h",
         "xfa/fwl/core/ifwl_dataprovider.h",
         "xfa/fwl/core/ifwl_form.h",
-        "xfa/fwl/core/ifwl_notedriver.h",
-        "xfa/fwl/core/ifwl_noteloop.h",
-        "xfa/fwl/core/ifwl_target.h",
         "xfa/fwl/core/ifwl_themeprovider.h",
-        "xfa/fwl/core/ifwl_thread.h",
         "xfa/fwl/core/ifwl_timer.h",
         "xfa/fwl/core/ifwl_tooltiptarget.h",
         "xfa/fwl/core/ifwl_widget.h",
         "xfa/fwl/core/ifwl_widgetdelegate.h",
         "xfa/fwl/core/ifwl_widgetmgr.h",
-        "xfa/fwl/core/ifwl_widgetmgrdelegate.h",
         "xfa/fwl/core/include/ifwl_adaptertimermgr.h",
         "xfa/fwl/lightwidget/cfwl_barcode.cpp",
         "xfa/fwl/lightwidget/cfwl_barcode.h",