Use Position instead of VisiblePosition for SurroundingText.

Source/core/editing/VisiblePosition.cpp

Index: Source/core/editing/VisiblePosition.cpp
diff --git a/Source/core/editing/VisiblePosition.cpp b/Source/core/editing/VisiblePosition.cpp
index 83d287b7ae5a15d71b25d9c1600ab7897aff0075..83d7015a285ebbd0e64c51ceb55abd5df51d905c 100644
--- a/Source/core/editing/VisiblePosition.cpp
+++ b/Source/core/editing/VisiblePosition.cpp
@@ -725,12 +725,7 @@ PassRefPtrWillBeRawPtr<Range> makeRange(const VisiblePosition &start, const Visi
     if (start.isNull() || end.isNull())
         return nullptr;
 
-    Position s = start.deepEquivalent().parentAnchoredEquivalent();
-    Position e = end.deepEquivalent().parentAnchoredEquivalent();
-    if (s.isNull() || e.isNull())
-        return nullptr;
-
-    return Range::create(s.containerNode()->document(), s.containerNode(), s.offsetInContainerNode(), e.containerNode(), e.offsetInContainerNode());
+    return makeRange(start.deepEquivalent(), end.deepEquivalent());
 }
 
 VisiblePosition startVisiblePosition(const Range *r, EAffinity affinity)