Migrate error messages, part 11.

src/weak-collection.js

Index: src/weak-collection.js
diff --git a/src/weak-collection.js b/src/weak-collection.js
index f9863c1b208f9a7c93adb6a96124db444ee93da4..4211baa669b0fbf64f1b713cfd86d0dd90d02504 100644
--- a/src/weak-collection.js
+++ b/src/weak-collection.js
@@ -52,9 +52,7 @@ function WeakMapSet(key, value) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakMap.prototype.set', this);
   }
-  if (!IS_SPEC_OBJECT(key)) {
-    throw %MakeTypeError('invalid_weakmap_key', [this, key]);
-  }
+  if (!IS_SPEC_OBJECT(key)) throw MakeTypeError(kInvalidWeakMapKey);
   return %WeakCollectionSet(this, key, value);
 }
 
@@ -124,9 +122,7 @@ function WeakSetAdd(value) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakSet.prototype.add', this);
   }
-  if (!IS_SPEC_OBJECT(value)) {
-    throw %MakeTypeError('invalid_weakset_value', [this, value]);
-  }
+  if (!IS_SPEC_OBJECT(value)) throw MakeTypeError(kInvalidWeakSetValue);
   return %WeakCollectionSet(this, value, true);
 }