Preparation for moving reusable handles to thread and more cleanups: isolate -> thread based handle…

runtime/vm/coverage.cc

Index: runtime/vm/coverage.cc
diff --git a/runtime/vm/coverage.cc b/runtime/vm/coverage.cc
index 82e7b547a3a753d50fdf69e648b350cf8fc1558f..65dc7e1d14dc1bca5e8ca8eeabb934db5b01c6a0 100644
--- a/runtime/vm/coverage.cc
+++ b/runtime/vm/coverage.cc
@@ -142,8 +142,7 @@ void CodeCoverage::PrintClass(const Library& lib,
                               CoverageFilter* filter,
                               bool as_call_sites) {
   Thread* thread = Thread::Current();
-  Isolate* isolate = thread->isolate();
-  if (cls.EnsureIsFinalized(isolate) != Error::null()) {
+  if (cls.EnsureIsFinalized(thread) != Error::null()) {
     // Only classes that have been finalized do have a meaningful list of
     // functions.
     return;