[runtime] Kill the %NumberToIntegerMapMinusZero runtime entry.

src/runtime/runtime-numbers.cc

Index: src/runtime/runtime-numbers.cc
diff --git a/src/runtime/runtime-numbers.cc b/src/runtime/runtime-numbers.cc
index efbdeb2f33b74b3f3bf78bd6ab49160571382140..0317b0ca2f0bc95e2203a8eb24585d5088e18052 100644
--- a/src/runtime/runtime-numbers.cc
+++ b/src/runtime/runtime-numbers.cc
@@ -174,20 +174,6 @@ RUNTIME_FUNCTION(Runtime_NumberToStringSkipCache) {
 }
 
 
-// TODO(bmeurer): Kill this runtime entry. Uses in date.js are wrong anyway.
-RUNTIME_FUNCTION(Runtime_NumberToIntegerMapMinusZero) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, input, Object::ToNumber(input));
-  double double_value = DoubleToInteger(input->Number());
-  // Map both -0 and +0 to +0.
-  if (double_value == 0) double_value = 0;
-
-  return *isolate->factory()->NewNumber(double_value);
-}
-
-
 // Converts a Number to a Smi, if possible. Returns NaN if the number is not
 // a small integer.
 RUNTIME_FUNCTION(Runtime_NumberToSmi) {