[collections] Fix error message.

R=gsathya@chromium.org

Bug: 
Change-Id: I66bc6cffddea540e382b7f59f519a4d902a0c1b6
Reviewed-on: https://chromium-review.googlesource.com/712050Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48569}

src/builtins/builtins-collections-gen.cc

@@ -1796,7 +1796,7 @@ TF_BUILTIN(WeakMapHas, CollectionsBuiltinsAssembler) {
   Label return_false(this);
 
   ThrowIfNotInstanceType(context, receiver, JS_WEAK_MAP_TYPE,
-                         "WeakMap.prototype.get");
+                         "WeakMap.prototype.has");
 
   GotoIf(TaggedIsSmi(key), &return_false);
   GotoIfNot(IsJSReceiver(key), &return_false);
@@ -1822,7 +1822,7 @@ TF_BUILTIN(WeakSetHas, CollectionsBuiltinsAssembler) {
   Label return_false(this);
 
   ThrowIfNotInstanceType(context, receiver, JS_WEAK_SET_TYPE,
-                         "WeakSet.prototype.get");
+                         "WeakSet.prototype.has");
 
   GotoIf(TaggedIsSmi(key), &return_false);
   GotoIfNot(IsJSReceiver(key), &return_false);