Remove unused context param from execute.

The IJS_Context parameter is never used, removed.

Review-Url: https://codereview.chromium.org/2035743002
diff --git a/fpdfsdk/javascript/JS_Runtime_Stub.cpp b/fpdfsdk/javascript/JS_Runtime_Stub.cpp
index e94f8c7..4930900 100644
--- a/fpdfsdk/javascript/JS_Runtime_Stub.cpp
+++ b/fpdfsdk/javascript/JS_Runtime_Stub.cpp
@@ -148,9 +148,7 @@
   }
 #endif  // PDF_ENABLE_XFA
 
-  int Execute(IJS_Context* cc,
-              const wchar_t* script,
-              CFX_WideString* info) override {
+  int Execute(const CFX_WideString& script, CFX_WideString* info) override {
     return 0;
   }