Some more cleanup of the finger print checking code.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
===================================================================
--- runtime/vm/dart_api_impl.cc	(revision 45703)
+++ runtime/vm/dart_api_impl.cc	(working copy)
@@ -45,8 +45,10 @@
 
 DECLARE_FLAG(bool, print_class_table);
 DECLARE_FLAG(bool, verify_handles);
+#if defined(DART_NO_SNAPSHOT)
 DEFINE_FLAG(bool, check_function_fingerprints, false,
             "Check function fingerprints");
+#endif  // defined(DART_NO_SNAPSHOT).
 DEFINE_FLAG(bool, trace_api, false,
             "Trace invocation of API calls (debug mode only)");
 DEFINE_FLAG(bool, verify_acquired_data, false,
@@ -1297,9 +1299,11 @@
         Error::Handle(isolate,
                       Dart::InitializeIsolate(snapshot, callback_data));
     if (error_obj.IsNull()) {
+#if defined(DART_NO_SNAPSHOT)
       if (FLAG_check_function_fingerprints) {
         Library::CheckFunctionFingerprints();
       }
+#endif  // defined(DART_NO_SNAPSHOT).
       START_TIMER(isolate, time_total_runtime);
       return reinterpret_cast<Dart_Isolate>(isolate);
     }