Revert of Pool implementation for zone segments

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index c3e5eb6b3771c8a32ddbbccd465c44e22d94e2b6..928f0417189c327569300e766eb307594b735b8a 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1933,8 +1933,8 @@
   VerboseAccountingAllocator(Heap* heap, size_t sample_bytes)
       : heap_(heap), last_memory_usage_(0), sample_bytes_(sample_bytes) {}
 
-  v8::internal::Segment* GetSegment(size_t size) override {
-    v8::internal::Segment* memory = AccountingAllocator::GetSegment(size);
+  v8::internal::Segment* AllocateSegment(size_t size) override {
+    v8::internal::Segment* memory = AccountingAllocator::AllocateSegment(size);
     if (memory) {
       size_t current = GetCurrentMemoryUsage();
       if (last_memory_usage_.Value() + sample_bytes_ < current) {
@@ -1945,8 +1945,8 @@
     return memory;
   }
 
-  void ReturnSegment(v8::internal::Segment* memory) override {
-    AccountingAllocator::ReturnSegment(memory);
+  void FreeSegment(v8::internal::Segment* memory) override {
+    AccountingAllocator::FreeSegment(memory);
     size_t current = GetCurrentMemoryUsage();
     if (current + sample_bytes_ < last_memory_usage_.Value()) {
       PrintJSON(current);