Fix for issue 28638 - flakiness on dartkp-dart-precompiled caused by MallocHooks

runtime/vm/malloc_hooks.h

Index: runtime/vm/malloc_hooks.h
diff --git a/runtime/vm/malloc_hooks.h b/runtime/vm/malloc_hooks.h
index 852c7992ec80c696b37a8d35ea0a0afa256fe3b4..78132c756e13f9d9f04cd91e9aed0f64ca3eee09 100644
--- a/runtime/vm/malloc_hooks.h
+++ b/runtime/vm/malloc_hooks.h
@@ -5,23 +5,23 @@
 #ifndef RUNTIME_VM_MALLOC_HOOKS_H_
 #define RUNTIME_VM_MALLOC_HOOKS_H_
 
+#include "vm/allocation.h"
 #include "vm/globals.h"
 
 namespace dart {
 
-class MallocHooks {
+class JSONObject;
+
+class MallocHooks : public AllStatic {
  public:
   static void InitOnce();
   static void TearDown();
   static void ResetStats();
-  static bool Initialized();
+  static bool Active();
+  static void PrintToJSONObject(JSONObject* jsobj);
 
   static intptr_t allocation_count();
   static intptr_t heap_allocated_memory_in_bytes();
-
- private:
-  DISALLOW_ALLOCATION();
-  DISALLOW_IMPLICIT_CONSTRUCTORS(MallocHooks);
 };
 
 }  // namespace dart