Clean up issues raised on previous CL.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 1296a20b01e7e2171e74680fd01da1f9ac718bfe..92d8a387a45122a3473455b2cf0fb494e1f7d981 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -870,8 +870,8 @@ class Isolate {
   Counters* counters() {
     // Call InitializeLoggingAndCounters() if logging is needed before
     // the isolate is fully initialized.
-    DCHECK(counters_ != NULL);
-    return counters_;
+    DCHECK(counters_shared_.get() != NULL);

[Mircea Trofin, 2017/06/05 15:35:11]

Nit: I realize this is existing code, but DCHECK_NOT_NULL

[kschimpf, 2017/06/05 18:05:43]

Done.

+    return counters_shared_.get();
   }
   std::shared_ptr<Counters> counters_shared() { return counters_shared_; }
   RuntimeProfiler* runtime_profiler() { return runtime_profiler_; }
@@ -1430,7 +1430,6 @@ class Isolate {
   RuntimeProfiler* runtime_profiler_;
   CompilationCache* compilation_cache_;
   std::shared_ptr<Counters> counters_shared_;
-  Counters* counters_;
   base::RecursiveMutex break_access_;
   Logger* logger_;
   StackGuard stack_guard_;