Introduce visiblePositionOf() with PositionWithAffinity as replacement of VisiblePosition constructo

Source/web/ContextMenuClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 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 111 matching lines @@
         // Don't provide suggestions for multiple words.
         if (!isASingleWord(misspelledWord))
             return String();
         return misspelledWord;
     }
 
     // Selection is empty, so change the selection to the word under the cursor.
     HitTestResult hitTestResult = selectedFrame->eventHandler().
         hitTestResultAtPoint(selectedFrame->page()->contextMenuController().hitTestResult().pointInInnerNodeFrame());
     Node* innerNode = hitTestResult.innerNode();
-    VisiblePosition pos(innerNode->layoutObject()->positionForPoint(
+    VisiblePosition pos = visiblePositionOf(innerNode->layoutObject()->positionForPoint(
         hitTestResult.localPoint()));
 
     if (pos.isNull())
         return misspelledWord; // It is empty.
 
     WebLocalFrameImpl::selectWordAroundPosition(selectedFrame, pos);
     misspelledWord = selectedFrame->selectedText().stripWhiteSpace();
 
 #if OS(MACOSX)
     // If misspelled word is still empty, then that portion should not be
@@ skipping 323 matching lines @@
         outputItems[i] = subItems[i];
     subMenuItems.swap(outputItems);
 }
 
 void ContextMenuClientImpl::populateCustomMenuItems(const ContextMenu* defaultMenu, WebContextMenuData* data)
 {
     populateSubMenuItems(defaultMenu->items(), data->customItems);
 }
 
 } // namespace blink