[css-grid] Remove unused method GridTrackSizingAlgorithm::IsTrackSizingOperation()

third_party/WebKit/Source/core/layout/GridTrackSizingAlgorithm.h

 // Copyright 2017 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 GridTrackSizingAlgorithm_h
 #define GridTrackSizingAlgorithm_h
 
 #include <memory>
 #include "core/layout/LayoutBox.h"
 #include "core/style/GridPositionsResolver.h"
@@ skipping 92 matching lines @@
   LayoutUnit MaxContentSize() const { return max_content_size_; };
 
   Vector<GridTrack>& Tracks(GridTrackSizingDirection);
   const Vector<GridTrack>& Tracks(GridTrackSizingDirection) const;
 
   Optional<LayoutUnit> FreeSpace(GridTrackSizingDirection);
   void SetFreeSpace(GridTrackSizingDirection, Optional<LayoutUnit>);
 
 #if DCHECK_IS_ON()
   bool TracksAreWiderThanMinTrackBreadth() const;
-  bool IsTrackSizingOperation() const {
-    return sizing_operation_ == kTrackSizing;
-  };
 #endif
 
  private:
   GridTrackSize GetGridTrackSize(GridTrackSizingDirection,
                                  size_t translated_index) const;
   GridTrackSize RawGridTrackSize(GridTrackSizingDirection,
                                  size_t translated_index) const;
   LayoutUnit AssumedRowsSizeForOrthogonalChild(const LayoutBox&) const;
   LayoutUnit ComputeTrackBasedSize() const;
 
@@ skipping 173 matching lines @@
   static GridTrackSizingDirection FlowAwareDirectionForChild(
       const LayoutGrid*,
       const LayoutBox& child,
       GridTrackSizingDirection);
 
   GridTrackSizingAlgorithm& algorithm_;
 };
 }
 
 #endif  // GridTrackSizingAlgorithm_h