Update weak_ptr_unittest.nc expectation

base/memory/weak_ptr_unittest.nc

Index: base/memory/weak_ptr_unittest.nc
diff --git a/base/memory/weak_ptr_unittest.nc b/base/memory/weak_ptr_unittest.nc
index 4456529a9f5c2b6af50f6fd53f9cb5a4904a47a7..9b1226b7941da4117732b211dffe490e9caf9017 100644
--- a/base/memory/weak_ptr_unittest.nc
+++ b/base/memory/weak_ptr_unittest.nc
@@ -129,7 +129,7 @@ void WontCompile() {
   WeakPtr<Unrelated> ptr = AsWeakPtr(&f);
 }
 
-#elif defined(NCTEST_AMBIGUOUS_ANCESTORS)  // [r"fatal error: member 'AsWeakPtr' found in multiple base classes of different types"]
+#elif defined(NCTEST_AMBIGUOUS_ANCESTORS)  // [r"fatal error: use of undeclared identifier 'AsWeakPtrImpl'"]
 
 void WontCompile() {
   MultiplyDerivedProducer f;