Move {next,previous}PositionOf() for VisiblePosition to VisibleUnits.cpp

Source/core/editing/VisiblePosition.h

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 #ifndef VisiblePosition_h
 #define VisiblePosition_h
 
 #include "core/CoreExport.h"
-#include "core/editing/EditingBoundary.h"
 #include "core/editing/PositionWithAffinity.h"
 #include "core/editing/TextAffinity.h"
 #include "platform/heap/Handle.h"
-#include "platform/text/TextDirection.h"
 
 namespace blink {
 
 // VisiblePosition default affinity is downstream because
 // the callers do not really care (they just want the
 // deep position without regard to line position), and this
 // is cheaper than UPSTREAM
 #define VP_DEFAULT_AFFINITY TextAffinity::Downstream
 
 // Callers who do not know where on the line the position is,
@@ skipping 95 matching lines @@
 UChar32 characterBefore(const VisiblePosition&);
 
 // TODO(yosin) We should move |honorEditingBoundaryAtOr{Before,After} to
 // "VisibleUnits.cpp" as static function.
 // next() and previous() will increment/decrement by a character cluster.
 VisiblePosition honorEditingBoundaryAtOrBefore(const VisiblePosition&, const Position& anchor);
 PositionWithAffinity honorEditingBoundaryAtOrBeforeOf(const PositionWithAffinity&, const Position& anchor);
 PositionInComposedTreeWithAffinity honorEditingBoundaryAtOrBeforeOf(const PositionInComposedTreeWithAffinity&, const PositionInComposedTree& anchor);
 VisiblePosition honorEditingBoundaryAtOrAfter(const VisiblePosition&, const Position& anchor);
 
-// TODO(yosin) We should move |nextPositionOf()| to "VisibleUnits.cpp".
-VisiblePosition nextPositionOf(const VisiblePosition&, EditingBoundaryCrossingRule = CanCrossEditingBoundary);
-// TODO(yosin) We should move |previousPositionOf()| to "VisibleUnits.cpp"
-VisiblePosition previousPositionOf(const VisiblePosition&, EditingBoundaryCrossingRule = CanCrossEditingBoundary);
-
 CORE_EXPORT VisiblePosition visiblePositionOf(const Position&, TextAffinity = VP_DEFAULT_AFFINITY);
 CORE_EXPORT VisiblePosition visiblePositionOf(const PositionInComposedTree&, TextAffinity = VP_DEFAULT_AFFINITY);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::VisiblePosition*);
 void showTree(const blink::VisiblePosition&);
 #endif
 
 #endif // VisiblePosition_h