Merge to XFA: Pass IJS_Runtime, not IJS_Context, to native object constructors.

Original Review URL: https://codereview.chromium.org/1389163007 .
(cherry picked from commit 848a13b6777cbff8cc4aea3ab3d69eaa0b82ae6c)

Merge conflics in:
fpdfsdk/src/javascript/JS_Runtime.cpp
fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
fpdfsdk/src/jsapi/fxjs_v8.cpp

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1394993006 .
diff --git a/fpdfsdk/src/javascript/Field.h b/fpdfsdk/src/javascript/Field.h
index b263241..21ae04c 100644
--- a/fpdfsdk/src/javascript/Field.h
+++ b/fpdfsdk/src/javascript/Field.h
@@ -501,7 +501,7 @@
   CJS_Field(v8::Local<v8::Object> pObject) : CJS_Object(pObject) {}
   ~CJS_Field(void) override {}
 
-  FX_BOOL InitInstance(IJS_Context* cc) override;
+  void InitInstance(IJS_Runtime* pIRuntime) override;
 
   DECLARE_JS_CLASS();
   JS_STATIC_PROP(alignment, Field);