Revert "Add Jack modifier."

This reverts commit 6ffd0967027c092a62d7100ca42ceded369c8ca1.

Change-Id: Ia69241a5100e8f740379e2ed944279de4daaf9ed
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index e23f1b1..9248ee4 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -1728,8 +1728,7 @@
   klass->SetClass(GetClassRoot(kJavaLangClass));
   uint32_t access_flags = dex_class_def.access_flags_;
   // Make sure that none of our runtime-only flags are set.
-  // TODO: JACK CLASS ACCESS (HACK TO BE REMOVED)
-  CHECK_EQ(access_flags & ~(kAccJavaFlagsMask | kAccClassJack), 0U);
+  CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U);
   klass->SetAccessFlags(access_flags);
   klass->SetClassLoader(class_loader);
   DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot);