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 .
diff --git a/fpdfsdk/src/javascript/JS_Context.cpp b/fpdfsdk/src/javascript/JS_Context.cpp
index 51c18f1..3c9be58 100644
--- a/fpdfsdk/src/javascript/JS_Context.cpp
+++ b/fpdfsdk/src/javascript/JS_Context.cpp
@@ -56,8 +56,8 @@
   FXJSErr error = {NULL, NULL, 0};
   int nRet = 0;
   if (script.GetLength() > 0) {
-    nRet = JS_Execute(*m_pRuntime, this, script.c_str(), script.GetLength(),
-                      &error);
+    nRet = JS_Execute(m_pRuntime->GetIsolate(), this, script.c_str(),
+                      script.GetLength(), &error);
   }
 
   if (nRet < 0) {