Moved zones and zone related stuff in its own directory.

src/crankshaft/unique.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CRANKSHAFT_UNIQUE_H_
 #define V8_CRANKSHAFT_UNIQUE_H_
 
 #include <ostream>  // NOLINT(readability/streams)
 
 #include "src/assert-scope.h"
 #include "src/base/functional.h"
 #include "src/handles.h"
 #include "src/utils.h"
-#include "src/zone.h"
+#include "src/zone/zone.h"
 
 namespace v8 {
 namespace internal {
 
 
 template <typename T>
 class UniqueSet;
 
 
 // Represents a handle to an object on the heap, but with the additional
@@ skipping 328 matching lines @@
       capacity_ = new_capacity;
       array_ = new_array;
     }
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_UNIQUE_H_