Get rid of ZoneScope completely.

test/cctest/test-liveedit.cc

Index: test/cctest/test-liveedit.cc
diff --git a/test/cctest/test-liveedit.cc b/test/cctest/test-liveedit.cc
index 2c89a387dc900468d8d05d019d9f1f229e949aea..d02f4f46e883e41deecef7ad028f5b9e4ddc53bf 100644
--- a/test/cctest/test-liveedit.cc
+++ b/test/cctest/test-liveedit.cc
@@ -76,19 +76,20 @@ class DiffChunkStruct : public ZoneObject {
 
 class ListDiffOutputWriter : public Comparator::Output {
  public:
-  explicit ListDiffOutputWriter(DiffChunkStruct** next_chunk_pointer)
-      : next_chunk_pointer_(next_chunk_pointer) {
+  explicit ListDiffOutputWriter(DiffChunkStruct** next_chunk_pointer,
+                                Zone* zone)
+      : next_chunk_pointer_(next_chunk_pointer), zone_(zone) {
     (*next_chunk_pointer_) = NULL;
   }
   void AddChunk(int pos1, int pos2, int len1, int len2) {
-    current_chunk_ = new(Isolate::Current()->runtime_zone()) DiffChunkStruct(
-        pos1, pos2, len1, len2);
+    current_chunk_ = new(zone_) DiffChunkStruct(pos1, pos2, len1, len2);
     (*next_chunk_pointer_) = current_chunk_;
     next_chunk_pointer_ = &current_chunk_->next;
   }
  private:
   DiffChunkStruct** next_chunk_pointer_;
   DiffChunkStruct* current_chunk_;
+  Zone* zone_;
 };
 
 
@@ -96,10 +97,10 @@ void CompareStringsOneWay(const char* s1, const char* s2,
                           int expected_diff_parameter = -1) {
   StringCompareInput input(s1, s2);
 
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  Zone zone(Isolate::Current());
 
   DiffChunkStruct* first_chunk;
-  ListDiffOutputWriter writer(&first_chunk);
+  ListDiffOutputWriter writer(&first_chunk, &zone);
 
   Comparator::CalculateDifference(&input, &writer);