cc: Drop an unused member variable from tiling data iterators

cc/base/tiling_data.h

 // Copyright 2010 The Chromium 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 CC_BASE_TILING_DATA_H_
 #define CC_BASE_TILING_DATA_H_
 
 #include <utility>
 
 #include "base/basictypes.h"
@@ skipping 58 matching lines @@
    public:
     operator bool() const { return index_x_ != -1 && index_y_ != -1; }
 
     int index_x() const { return index_x_; }
     int index_y() const { return index_y_; }
     std::pair<int, int> index() const {
      return std::make_pair(index_x_, index_y_);
     }
 
    protected:
-    explicit BaseIterator(const TilingData* tiling_data);
+    BaseIterator();
     void done() {
       index_x_ = -1;
       index_y_ = -1;
     }
 
-    const TilingData* tiling_data_;
     int index_x_;
     int index_y_;
   };
 
   // Iterate through tiles whose bounds + optional border intersect with |rect|.
   class CC_EXPORT Iterator : public BaseIterator {
    public:
     Iterator();
     Iterator(const TilingData* tiling_data,
              const gfx::Rect& consider_rect,
@@ skipping 161 matching lines @@
   int border_texels_;
 
   // These are computed values.
   int num_tiles_x_;
   int num_tiles_y_;
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_TILING_DATA_H_