Revert of Compute snap offsets (both repeat and element based)

third_party/WebKit/Source/core/page/scrolling/SnapCoordinator.h

Index: third_party/WebKit/Source/core/page/scrolling/SnapCoordinator.h
diff --git a/third_party/WebKit/Source/core/page/scrolling/SnapCoordinator.h b/third_party/WebKit/Source/core/page/scrolling/SnapCoordinator.h
deleted file mode 100644
index b9063e662d53231161c4c3b496570d8c99ebebe9..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/page/scrolling/SnapCoordinator.h
+++ /dev/null
@@ -1,58 +0,0 @@
-// Copyright 2016 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 SnapCoordinator_h
-#define SnapCoordinator_h
-
-#include "core/layout/LayoutBox.h"
-#include "platform/heap/Handle.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-class ComputedStyle;
-class Element;
-struct LengthPoint;
-
-// Snap Coordinator keeps track of snap containers and all of their associated
-// snap areas. It also contains the logic to generate the list of valid snap
-// positions for a given snap container.
-//
-// Snap container:
-//   An scroll container that has 'scroll-snap-type' value other
-//   than 'none'.
-// Snap area:
-//   A snap container's descendant that contributes snap positions. An element
-//   only contributes snap positions to its nearest ancestor (on the element’s
-//   containing block chain) scroll container.
-//
-// For more information see spec: https://drafts.csswg.org/css-snappoints/
-class CORE_EXPORT SnapCoordinator final : public GarbageCollectedFinalized<SnapCoordinator> {
-    WTF_MAKE_NONCOPYABLE(SnapCoordinator);
-
-public:
-    static SnapCoordinator* create();
-    ~SnapCoordinator();
-    DEFINE_INLINE_TRACE() {}
-
-    void snapContainerDidChange(LayoutBox&, ScrollSnapType);
-    void snapAreaDidChange(LayoutBox&, const Vector<LengthPoint>& snapCoordinates);
-
-#ifndef NDEBUG
-    void showSnapAreaMap();
-    void showSnapAreasFor(const LayoutBox*);
-#endif
-
-private:
-    friend class SnapCoordinatorTest;
-    explicit SnapCoordinator();
-
-    Vector<double> snapOffsets(const ContainerNode&, ScrollbarOrientation);
-
-    HashSet<const LayoutBox*> m_snapContainers;
-};
-
-} // namespace blink
-
-#endif // SnapCoordinator_h