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/JS_Context.h b/fpdfsdk/src/javascript/JS_Context.h
index 7fbcbec..dc5d833 100644
--- a/fpdfsdk/src/javascript/JS_Context.h
+++ b/fpdfsdk/src/javascript/JS_Context.h
@@ -21,7 +21,7 @@
 
   // IJS_Context
   FX_BOOL RunScript(const CFX_WideString& script,
-                    CFX_WideString& info) override;
+                    CFX_WideString* info) override;
   void OnApp_Init() override;
   void OnDoc_Open(CPDFSDK_Document* pDoc,
                   const CFX_WideString& strTargetName) override;