Migrate error messages, part 2.

src/symbol.js

Index: src/symbol.js
diff --git a/src/symbol.js b/src/symbol.js
index 4ea77979c237c85ef15cb663be18ac4cfa127746..0f5ecb7984d8ce9ebcfa0edbbb29cb560ba4234a 100644
--- a/src/symbol.js
+++ b/src/symbol.js
@@ -34,8 +34,8 @@ function SymbolConstructor(x) {
 
 function SymbolToString() {
   if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
-    throw MakeTypeError(
-      'incompatible_method_receiver', ["Symbol.prototype.toString", this]);
+    throw MakeTypeError(kIncompatibleMethodReceiver,
+                        "Symbol.prototype.toString", this);
   }
   var description = %SymbolDescription(%_ValueOf(this));
   return "Symbol(" + (IS_UNDEFINED(description) ? "" : description) + ")";
@@ -44,8 +44,8 @@ function SymbolToString() {
 
 function SymbolValueOf() {
   if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
-    throw MakeTypeError(
-      'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]);
+    throw MakeTypeError(kIncompatibleMethodReceiver,
+                        "Symbol.prototype.valueOf", this);
   }
   return %_ValueOf(this);
 }