Move computeInlineBoxPosition() to VisibleUnits.{cpp,h} from Position.{cpp,h} and VisiblePosition.h

Source/core/editing/RenderedPosition.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/editing/RenderedPosition.h"
 
 #include "core/editing/TextAffinity.h"
 #include "core/editing/VisiblePosition.h"
+#include "core/editing/VisibleUnits.h"
 #include "core/layout/compositing/CompositedSelectionBound.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 
 namespace blink {
 
 static inline LayoutObject* layoutObjectFromPosition(const Position& position)
 {
     ASSERT(position.isNotNull());
     Node* layoutObjectNode = nullptr;
     switch (position.anchorType()) {
@@ skipping 214 matching lines @@
 bool layoutObjectContainsPosition(LayoutObject* target, const Position& position)
 {
     for (LayoutObject* layoutObject = layoutObjectFromPosition(position); layoutObject && layoutObject->node(); layoutObject = layoutObject->parent()) {
         if (layoutObject == target)
             return true;
     }
     return false;
 }
 
 };