Small cleanups in the Kernel FlowGraphBuilder

runtime/vm/kernel_reader.h

Index: runtime/vm/kernel_reader.h
diff --git a/runtime/vm/kernel_reader.h b/runtime/vm/kernel_reader.h
index a4c739d87b1b1f9892413b7da4809057ccbb3d6a..a483d3827b2956b90c5554e4a9f5df4656ba32a5 100644
--- a/runtime/vm/kernel_reader.h
+++ b/runtime/vm/kernel_reader.h
@@ -19,11 +19,8 @@ class KernelReader;
 
 class BuildingTranslationHelper : public TranslationHelper {
  public:
-  BuildingTranslationHelper(KernelReader* reader,
-                            dart::Thread* thread,
-                            dart::Zone* zone,
-                            Isolate* isolate)
-      : TranslationHelper(thread, zone, isolate), reader_(reader) {}
+  BuildingTranslationHelper(KernelReader* reader, dart::Thread* thread)
+      : TranslationHelper(thread), reader_(reader) {}
   virtual ~BuildingTranslationHelper() {}
 
   virtual RawLibrary* LookupLibraryByKernelLibrary(Library* library);