Refactor allocation policies.

src/allocation-inl.h

Index: src/allocation-inl.h
diff --git a/src/allocation-inl.h b/src/allocation-inl.h
index 04a3fe667abca7fd54c46926033217b413ebcbab..7bc48f03316b3d6316a837a55edc807f377add55 100644
--- a/src/allocation-inl.h
+++ b/src/allocation-inl.h
@@ -34,13 +34,17 @@ namespace v8 {
 namespace internal {
 
 
-void* PreallocatedStorage::New(size_t size) {
-  return Isolate::Current()->PreallocatedStorageNew(size);
+PreallocatedStorageAllocator::PreallocatedStorageAllocator()
+    : isolate_(Isolate::Current()) {}
+
+
+void* PreallocatedStorageAllocator::New(size_t size) {
+  return isolate_->PreallocatedStorageNew(size);
 }
 
 
-void PreallocatedStorage::Delete(void* p) {
-  return Isolate::Current()->PreallocatedStorageDelete(p);
+void PreallocatedStorageAllocator::Delete(void* p) {
+  return isolate_->PreallocatedStorageDelete(p);
 }