- Remove deprecated StackZone constructor with Isolate parameter.

runtime/vm/zone.h

Index: runtime/vm/zone.h
diff --git a/runtime/vm/zone.h b/runtime/vm/zone.h
index 79591a5dfaadf46ca4e679fd9297f18960594e35..4850e5eb321d67863cd7d6b587a016148e69c911 100644
--- a/runtime/vm/zone.h
+++ b/runtime/vm/zone.h
@@ -178,13 +178,15 @@ class StackZone : public StackResource {
  public:
   // Create an empty zone and set is at the current zone for the Thread.
   explicit StackZone(Thread* thread) : StackResource(thread), zone_() {
-    Initialize();
-  }
-
-  // DEPRECATED: Use Thread-based interface. During migration, this defaults
-  // to using the mutator thread (which must also be the current thread).
-  explicit StackZone(Isolate* isolate) : StackResource(isolate), zone_() {
-    Initialize();
+#ifdef DEBUG
+    if (FLAG_trace_zones) {
+      OS::PrintErr("*** Starting a new Stack zone 0x%" Px "(0x%" Px ")\n",
+                   reinterpret_cast<intptr_t>(this),
+                   reinterpret_cast<intptr_t>(&zone_));
+    }
+#endif
+    zone_.Link(thread->zone());
+    thread->set_zone(&zone_);
   }
 
   // Delete all memory associated with the zone.
@@ -209,18 +211,6 @@ class StackZone : public StackResource {
  private:
   Zone zone_;
 
-  void Initialize() {
-#ifdef DEBUG
-    if (FLAG_trace_zones) {
-      OS::PrintErr("*** Starting a new Stack zone 0x%" Px "(0x%" Px ")\n",
-                   reinterpret_cast<intptr_t>(this),
-                   reinterpret_cast<intptr_t>(&zone_));
-    }
-#endif
-    zone_.Link(thread()->zone());
-    thread()->set_zone(&zone_);
-  }
-
   template<typename T> friend class GrowableArray;
   template<typename T> friend class ZoneGrowableArray;