Introduce visiblePositionOf() with PositionWithAffinity as replacement of VisiblePosition constructo

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 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 4405 matching lines @@
     webViewHelper.webView()->selectionBounds(startWebRect, endWebRect);
 
     EXPECT_EQ(0, frame->frame()->selection().rootEditableElement()->scrollLeft());
     frame->moveRangeSelectionExtent(WebPoint(endWebRect.x + 500, endWebRect.y));
     EXPECT_GE(frame->frame()->selection().rootEditableElement()->scrollLeft(), 1);
     EXPECT_EQ("Lengthy text goes here.", selectionAsString(frame));
 }
 
 static int computeOffset(LayoutObject* layoutObject, int x, int y)
 {
-    return VisiblePosition(layoutObject->positionForPoint(LayoutPoint(x, y))).deepEquivalent().computeOffsetInContainerNode();
+    return visiblePositionOf(layoutObject->positionForPoint(LayoutPoint(x, y))).deepEquivalent().computeOffsetInContainerNode();
 }
 
 // positionForPoint returns the wrong values for contenteditable spans. See
 // http://crbug.com/238334.
 TEST_P(ParameterizedWebFrameTest, DISABLED_PositionForPointTest)
 {
     registerMockedHttpURLLoad("select_range_span_editable.html");
     FrameTestHelpers::WebViewHelper webViewHelper(this);
     initializeTextSelectionWebView(m_baseURL + "select_range_span_editable.html", &webViewHelper);
     WebLocalFrameImpl* mainFrame = toWebLocalFrameImpl(webViewHelper.webView()->mainFrame());
@@ skipping 3633 matching lines @@
 
 TEST_F(WebFrameTest, MaxFramesDetach)
 {
     registerMockedHttpURLLoad("max-frames-detach.html");
     FrameTestHelpers::WebViewHelper webViewHelper;
     WebViewImpl* webViewImpl = webViewHelper.initializeAndLoad(m_baseURL + "max-frames-detach.html", true);
     webViewImpl->mainFrameImpl()->collectGarbage();
 }
 
 } // namespace blink