Introduce Position constructor with const Node&

third_party/WebKit/Source/core/editing/PlainTextRange.cpp

Index: third_party/WebKit/Source/core/editing/PlainTextRange.cpp
diff --git a/third_party/WebKit/Source/core/editing/PlainTextRange.cpp b/third_party/WebKit/Source/core/editing/PlainTextRange.cpp
index 849d7e4d817c015c5f46f1b219d66d78b977bc1d..90eefdb4938d41017e4de2a8a88620539bcd197d 100644
--- a/third_party/WebKit/Source/core/editing/PlainTextRange.cpp
+++ b/third_party/WebKit/Source/core/editing/PlainTextRange.cpp
@@ -184,10 +184,10 @@ PlainTextRange PlainTextRange::Create(const ContainerNode& scope,
   DocumentLifecycle::DisallowTransitionScope disallow_transition(
       scope.GetDocument().Lifecycle());
 
-  size_t start = TextIterator::RangeLength(
-      Position(&const_cast<ContainerNode&>(scope), 0), range.StartPosition());
-  size_t end = TextIterator::RangeLength(
-      Position(&const_cast<ContainerNode&>(scope), 0), range.EndPosition());
+  size_t start =
+      TextIterator::RangeLength(Position(scope, 0), range.StartPosition());
+  size_t end =
+      TextIterator::RangeLength(Position(scope, 0), range.EndPosition());
 
   return PlainTextRange(start, end);
 }