Removed comment talking about a removed parameter

QuickCompilerCallbacks used to have a `verification_results` parameter,
which got removed in https://android-review.googlesource.com/439821

Change-Id: I9dc891425662bc753a50860a9d8112f24072c367
diff --git a/dex2oat/dex2oat.cc b/dex2oat/dex2oat.cc
index e24ce0a..fe46552 100644
--- a/dex2oat/dex2oat.cc
+++ b/dex2oat/dex2oat.cc
@@ -1409,8 +1409,6 @@
       return dex2oat::ReturnCode::kOther;
     }
 
-    // Verification results are null since we don't know if we will need them yet as the compiler
-    // filter may change.
     callbacks_.reset(new QuickCompilerCallbacks(
         // For class verification purposes, boot image extension is the same as boot image.
         (IsBootImage() || IsBootImageExtension())