Make VisiblePosition::FirstPositionInNode() to take const Node& instead of Node*

third_party/WebKit/Source/core/svg/SVGTextContentElement.cpp

Index: third_party/WebKit/Source/core/svg/SVGTextContentElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGTextContentElement.cpp b/third_party/WebKit/Source/core/svg/SVGTextContentElement.cpp
index 9a1ea04b7e228cf9c1bd39cc086587d4c9aab8b0..8e9533b61cfb54646819e1aec0cc149fb94f28a9 100644
--- a/third_party/WebKit/Source/core/svg/SVGTextContentElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGTextContentElement.cpp
@@ -215,7 +215,7 @@ void SVGTextContentElement::selectSubString(unsigned charnum,
 
   // Find selection start
   VisiblePosition start = VisiblePosition::FirstPositionInNode(
-      const_cast<SVGTextContentElement*>(this));
+      *const_cast<SVGTextContentElement*>(this));
   for (unsigned i = 0; i < charnum; ++i)
     start = NextPositionOf(start);