Revert of Move SelectionAdjust to its own file

third_party/WebKit/Source/core/editing/VisibleSelection.h

 /*
  * Copyright (C) 2004 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 187 matching lines @@
     bool m_baseIsFirst : 1; // True if base is before the extent
     bool m_isDirectional : 1; // Non-directional ignores m_baseIsFirst and selection always extends on shift + arrow key.
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT VisibleSelectionTemplate<EditingStrategy>;
 extern template class CORE_EXTERN_TEMPLATE_EXPORT VisibleSelectionTemplate<EditingInComposedTreeStrategy>;
 
 using VisibleSelection = VisibleSelectionTemplate<EditingStrategy>;
 using VisibleSelectionInComposedTree = VisibleSelectionTemplate<EditingInComposedTreeStrategy>;
 
+// TODO(yosin): We should move |SelectionAdjuster| to its own file.
+class SelectionAdjuster final {
+    STATIC_ONLY(SelectionAdjuster);
+public:
+    static void adjustSelectionInComposedTree(VisibleSelectionInComposedTree*, const VisibleSelection&);
+    static void adjustSelectionInDOMTree(VisibleSelection*, const VisibleSelectionInComposedTree&);
+    static void adjustSelectionToAvoidCrossingShadowBoundaries(VisibleSelection*);
+    static void adjustSelectionToAvoidCrossingShadowBoundaries(VisibleSelectionInComposedTree*);
+};
+
 // TODO(yosin): We should use |operator==()| instead of
 // |equalSelectionsInDOMTree()|.
 bool equalSelectionsInDOMTree(const VisibleSelection&, const VisibleSelection&);
 
 // We don't yet support multi-range selections, so we only ever have one range
 // to return.
 CORE_EXPORT EphemeralRange firstEphemeralRangeOf(const VisibleSelection&);
 
 // TODO(sof): move more firstRangeOf() uses to be over EphemeralRange instead.
 CORE_EXPORT PassRefPtrWillBeRawPtr<Range> firstRangeOf(const VisibleSelection&);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::VisibleSelection&);
 void showTree(const blink::VisibleSelection*);
 void showTree(const blink::VisibleSelectionInComposedTree&);
 void showTree(const blink::VisibleSelectionInComposedTree*);
 #endif
 
 #endif // VisibleSelection_h