Revert of Improve performance of GeometryMapper cache.

third_party/WebKit/Source/platform/graphics/paint/GeometryMapperTransformCache.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 GeometryMapperTransformCache_h
-#define GeometryMapperTransformCache_h
-
-#include "platform/PlatformExport.h"
-
-#include "platform/transforms/TransformationMatrix.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-class TransformPaintPropertyNode;
-
-// A GeometryMapperTransformCache hangs off a TransformPaintPropertyNode. It
-// stores cached "transformed rects" (See GeometryMapper.h) from that node in
-// ancestor spaces.
-class PLATFORM_EXPORT GeometryMapperTransformCache {
- public:
-  GeometryMapperTransformCache(){};
-
-  // Returns the transformed rect (see GeometryMapper.h) of |this| in the
-  // space of |ancestorTransform|, if there is one cached. Otherwise returns
-  // null.
-  const TransformationMatrix* getCachedTransform(
-      const TransformPaintPropertyNode* ancestorTransform);
-
-  // Stores the "transformed rect" of |this| in the space of |ancestors|,
-  // into a local cache.
-  void setCachedTransform(const TransformPaintPropertyNode* ancestorTransform,
-                          const TransformationMatrix& toAncestor);
-
-  static void clearCache();
-
- private:
-  struct TransformCacheEntry {
-    const TransformPaintPropertyNode* ancestorNode;
-    TransformationMatrix toAncestor;
-    TransformCacheEntry(const TransformPaintPropertyNode* ancestorNodeArg,
-                        const TransformationMatrix& toAncestorArg)
-        : ancestorNode(ancestorNodeArg), toAncestor(toAncestorArg) {}
-  };
-
-  void invalidateCacheIfNeeded();
-
-  Vector<TransformCacheEntry> m_transformCache;
-  unsigned m_cacheGeneration;
-
-  DISALLOW_COPY_AND_ASSIGN(GeometryMapperTransformCache);
-};
-
-}  // namespace blink
-
-#endif  // GeometryMapperTransformCache_h