Refactor allocation policies.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 8a30e7924fb9215c278f1467ba1d99b35fc5e54a..5186b98460387e9e48f49aea93598f94ec2aa838 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -243,7 +243,7 @@ void Isolate::PreallocatedStorageInit(size_t size) {
 
 void* Isolate::PreallocatedStorageNew(size_t size) {
   if (!preallocated_storage_preallocated_) {
-    return FreeStoreAllocationPolicy::New(size);
+    return FreeStoreAllocator().New(size);
   }
   ASSERT(free_list_.next_ != &free_list_);
   ASSERT(free_list_.previous_ != &free_list_);
@@ -289,7 +289,7 @@ void Isolate::PreallocatedStorageDelete(void* p) {
     return;
   }
   if (!preallocated_storage_preallocated_) {
-    FreeStoreAllocationPolicy::Delete(p);
+    FreeStoreAllocator().Delete(p);
     return;
   }
   PreallocatedStorage* storage = reinterpret_cast<PreallocatedStorage*>(p) - 1;