[runtime] Port simple String.prototype.indexOf cases to TF Builtin

src/runtime/runtime-utils.h

Index: src/runtime/runtime-utils.h
diff --git a/src/runtime/runtime-utils.h b/src/runtime/runtime-utils.h
index 147efed092a742724f66013147e76ee4d1b66d0f..3e11bc0627bca7a203197f3a13db9c303e9a1406 100644
--- a/src/runtime/runtime-utils.h
+++ b/src/runtime/runtime-utils.h
@@ -24,7 +24,7 @@ namespace internal {
 
 #define CONVERT_NUMBER_ARG_HANDLE_CHECKED(name, index) \
   CHECK(args[index]->IsNumber());                      \
-  Handle<Object> name = args.at<Object>(index);
+  Handle<Object> name = args.at(index);
 
 // Cast the given object to a boolean and store it in a variable with
 // the given name.  If the object is not a boolean we crash safely.
@@ -47,10 +47,10 @@ namespace internal {
 
 // Cast the given argument to a size_t and store its value in a variable with
 // the given name.  If the argument is not a size_t we crash safely.
-#define CONVERT_SIZE_ARG_CHECKED(name, index)            \
-  CHECK(args[index]->IsNumber());                        \
-  Handle<Object> name##_object = args.at<Object>(index); \
-  size_t name = 0;                                       \
+#define CONVERT_SIZE_ARG_CHECKED(name, index)    \
+  CHECK(args[index]->IsNumber());                \
+  Handle<Object> name##_object = args.at(index); \
+  size_t name = 0;                               \
   CHECK(TryNumberToSize(*name##_object, &name));
 
 // Call the specified converter on the object *comand store the result in