Make most{Backward,Forward}CaretPosition() to handle first-letter pseudo element

third_party/WebKit/Source/core/layout/LayoutTextFragment.h

Index: third_party/WebKit/Source/core/layout/LayoutTextFragment.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutTextFragment.h b/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
index d5e036851e6e84bf480639b67e687263b46570f1..d4c6198f0a25305d21eb20d3170f8cf74afc4ebf 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
+++ b/third_party/WebKit/Source/core/layout/LayoutTextFragment.h
@@ -44,6 +44,7 @@ public:
     bool canBeSelectionLeaf() const override { return node() && node()->hasEditableStyle(); }
 
     unsigned start() const { return m_start; }
+    unsigned fragmentLength() const { return m_fragmentLength; }
 
     unsigned textStartOffset() const override { return start(); }
 
@@ -80,7 +81,6 @@ private:
 
     Text* associatedTextNode() const;
     void updateHitTestResult(HitTestResult&, const LayoutPoint&) override;
-    unsigned fragmentLength() const { return m_fragmentLength; }
 
     unsigned m_start;
     unsigned m_fragmentLength;