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/global.cpp b/fpdfsdk/src/javascript/global.cpp
index 97a74e7..403cf58 100644
--- a/fpdfsdk/src/javascript/global.cpp
+++ b/fpdfsdk/src/javascript/global.cpp
@@ -88,17 +88,12 @@
 
 IMPLEMENT_SPECIAL_JS_CLASS(CJS_Global, JSGlobalAlternate, global);
 
-FX_BOOL CJS_Global::InitInstance(IJS_Context* cc) {
-  CJS_Context* pContext = (CJS_Context*)cc;
-  ASSERT(pContext != NULL);
-
-  JSGlobalAlternate* pGlobal = (JSGlobalAlternate*)GetEmbedObject();
-  ASSERT(pGlobal != NULL);
-
-  pGlobal->Initial(pContext->GetReaderApp());
-
-  return TRUE;
-};
+void CJS_Global::InitInstance(IJS_Runtime* pIRuntime) {
+  CJS_Runtime* pRuntime = static_cast<CJS_Runtime*>(pIRuntime);
+  JSGlobalAlternate* pGlobal =
+      static_cast<JSGlobalAlternate*>(GetEmbedObject());
+  pGlobal->Initial(pRuntime->GetReaderApp());
+}
 
 JSGlobalAlternate::JSGlobalAlternate(CJS_Object* pJSObject)
     : CJS_EmbedObj(pJSObject), m_pApp(NULL) {