Move absoluteCaretBoundsOf() for VisiblePosition to VisibleUnits.cpp

Source/core/editing/VisiblePosition.h

Index: Source/core/editing/VisiblePosition.h
diff --git a/Source/core/editing/VisiblePosition.h b/Source/core/editing/VisiblePosition.h
index 3a59bda4f43c187054a2ba75f62c9456de3049b0..c38b3b3602a29e3dafbd0c579984bf89c058a0d2 100644
--- a/Source/core/editing/VisiblePosition.h
+++ b/Source/core/editing/VisiblePosition.h
@@ -112,10 +112,6 @@ private:
     TextAffinity m_affinity;
 };
 
-// TODO(yosin) We should move |absoluteCaretBoundsOf()| to "VisibleUnits.cpp".
-// Bounds of (possibly transformed) caret in absolute coords
-CORE_EXPORT IntRect absoluteCaretBoundsOf(const VisiblePosition&);
-
 // TODO(yosin) We should move |leftPositionOf()| and |rightPositionOf()| to
 // "VisibleUnits.cpp".
 VisiblePosition leftPositionOf(const VisiblePosition&);