Made AdjustAmountOfExternalAllocatedMemory an instance method of Isolate

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 4ec3936be557e3d9df1d7ace82417e99316b2453..94418107e8f4c3c9aa278a6872e21fbd39e0a282 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -5783,14 +5783,21 @@ void V8::AddImplicitReferences(Persistent<Object> parent,
 }
 
 
+intptr_t Isolate::AdjustAmountOfExternalAllocatedMemory(
+    intptr_t change_in_bytes) {
+  i::Heap* heap = reinterpret_cast<i::Isolate*>(this)->heap();
+  return heap->AdjustAmountOfExternalAllocatedMemory(change_in_bytes);
+}
+
+
 intptr_t V8::AdjustAmountOfExternalAllocatedMemory(intptr_t change_in_bytes) {
   i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   if (isolate == NULL || !isolate->IsInitialized() ||
       IsDeadCheck(isolate, "v8::V8::AdjustAmountOfExternalAllocatedMemory()")) {
     return 0;
   }
-  return isolate->heap()->AdjustAmountOfExternalAllocatedMemory(
-      change_in_bytes);
+  Isolate* isolate_ext = reinterpret_cast<Isolate*>(isolate);
+  return isolate_ext->AdjustAmountOfExternalAllocatedMemory(change_in_bytes);
 }