Remove portable.

Change-Id: I3bf3250fa866fd2265f1b115d52fa5dedc48a7fc
diff --git a/runtime/quick_exception_handler.h b/runtime/quick_exception_handler.h
index cf1ecbf..31622de 100644
--- a/runtime/quick_exception_handler.h
+++ b/runtime/quick_exception_handler.h
@@ -32,7 +32,7 @@
 class ThrowLocation;
 class ShadowFrame;
 
-// Manages exception delivery for Quick backend. Not used by Portable backend.
+// Manages exception delivery for Quick backend.
 class QuickExceptionHandler {
  public:
   QuickExceptionHandler(Thread* self, bool is_deoptimization)