Get rid of ZoneScope completely.

test/cctest/test-liveedit.cc

 // Copyright 2007-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 58 matching lines @@
   int pos1;
   int pos2;
   int len1;
   int len2;
   DiffChunkStruct* next;
 };
 
 
 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_;
 };
 
 
 void CompareStringsOneWay(const char* s1, const char* s2,
                           int expected_diff_parameter = -1) {
   StringCompareInput input(s1, s2);
 
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
+  Zone zone(Isolate::Current());
 
   DiffChunkStruct* first_chunk;
-  ListDiffOutputWriter writer(&first_chunk);
+  ListDiffOutputWriter writer(&first_chunk, &zone);
 
   Comparator::CalculateDifference(&input, &writer);
 
   int len1 = StrLength(s1);
   int len2 = StrLength(s2);
 
   int pos1 = 0;
   int pos2 = 0;
 
   int diff_parameter = 0;
@@ skipping 58 matching lines @@
   CompareStrings("cat", "ct", 1);
   CompareStrings("cat", "cat", 0);
   CompareStrings("", "", 0);
   CompareStrings("cat", "", 3);
   CompareStrings("a cat", "a capybara", 7);
   CompareStrings("abbabababababaaabbabababababbabbbbbbbababa",
                  "bbbbabababbbabababbbabababababbabbababa");
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT