Remove many features when building product mode

runtime/vm/debugger_api_impl.cc

Index: runtime/vm/debugger_api_impl.cc
diff --git a/runtime/vm/debugger_api_impl.cc b/runtime/vm/debugger_api_impl.cc
index 9ac461ce381251a0c49450f2cae87d2c0c6b69f8..829f0f5c12d9f73c8b3b075b5f1d238aaee9fe4b 100644
--- a/runtime/vm/debugger_api_impl.cc
+++ b/runtime/vm/debugger_api_impl.cc
@@ -18,6 +18,7 @@ namespace dart {
 // Facilitate quick access to the current zone once we have the curren thread.
 #define Z (T->zone())
 
+#ifndef PRODUCT
 
 #define UNWRAP_AND_CHECK_PARAM(type, var, param)                               \
   type& var = type::Handle();                                                  \
@@ -960,4 +961,12 @@ DART_EXPORT Dart_IsolateId Dart_GetIsolateId(Dart_Isolate dart_isolate) {
   return isolate->debugger()->GetIsolateId();
 }
 
+#else
+
+DART_EXPORT void Dart_SetPausedEventHandler(Dart_PausedEventHandler handler) {
+  // NOOP.
+}
+
+#endif  // !PRODUCT
+
 }  // namespace dart