Remove unused isolate parameter from NumberToSize and TryNumberToSize

src/conversions.h

Index: src/conversions.h
diff --git a/src/conversions.h b/src/conversions.h
index 7bbd3d29689a946044ffcb26c1f5006489048594..2dd91d93190c0936b9358f7ca0a4a22d7e9faba3 100644
--- a/src/conversions.h
+++ b/src/conversions.h
@@ -175,13 +175,10 @@ inline int64_t NumberToInt64(Object* number);
 double StringToDouble(UnicodeCache* unicode_cache, Handle<String> string,
                       int flags, double empty_string_val = 0.0);
 
-
-inline bool TryNumberToSize(Isolate* isolate, Object* number, size_t* result);
-
+inline bool TryNumberToSize(Object* number, size_t* result);
 
 // Converts a number into size_t.
-inline size_t NumberToSize(Isolate* isolate, Object* number);
-
+inline size_t NumberToSize(Object* number);
 
 // returns DoubleToString(StringToDouble(string)) == string
 bool IsSpecialIndex(UnicodeCache* unicode_cache, String* string);