Merge to XFA: Remove some abstractions in fxjs_v8.h. Conflicts: fpdfsdk/src/javascript/Document.cpp fpdfsdk/src/javascript/JS_Runtime.cpp fpdfsdk/src/jsapi/fxjs_v8.cpp New: fpdfsdk/src/fpdfxfa/fpdfxfa_app.cpp (cherry picked from commit 6df59849472958e7de96da6d9fc7b223b7c1f1c3) Original Review URL: https://codereview.chromium.org/1332973002 . R=thestig@chromium.org Review URL: https://codereview.chromium.org/1334833003 .