Fix Windows build

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index f850c99dca0f0d210e1f1e2f224ccc32310ba51c..ff628394146695e41eaba62d2a1ff6699da0a638 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -770,7 +770,7 @@ DART_EXPORT bool Dart_IsUnhandledExceptionError(Dart_Handle object) {
 
 
 DART_EXPORT bool Dart_IsCompilationError(Dart_Handle object) {
-  if (Dart_IsUnhandledExceptionError(object)) {
+  if (::Dart_IsUnhandledExceptionError(object)) {
     DARTSCOPE(Thread::Current());
     const UnhandledException& error =
         UnhandledException::Cast(Object::Handle(Z, Api::UnwrapHandle(object)));