Restrict visibility of internal TextCheckingParagraph predicates.

Source/core/editing/spellcheck/TextCheckingHelper.h

Index: Source/core/editing/spellcheck/TextCheckingHelper.h
diff --git a/Source/core/editing/spellcheck/TextCheckingHelper.h b/Source/core/editing/spellcheck/TextCheckingHelper.h
index 12647a20cd15f269f39b98ebfb78a6a66d96df59..9ff06efc120d6f4d5c326ad92372a0a68603528c 100644
--- a/Source/core/editing/spellcheck/TextCheckingHelper.h
+++ b/Source/core/editing/spellcheck/TextCheckingHelper.h
@@ -53,8 +53,6 @@ public:
     UChar textCharAt(int index) const { return text()[static_cast<unsigned>(index)]; }
 
     bool isEmpty() const;
-    bool isTextEmpty() const { return text().isEmpty(); }
-    bool isRangeEmpty() const { return checkingStart() >= checkingEnd(); }
 
     int checkingStart() const;
     int checkingEnd() const;
@@ -68,6 +66,9 @@ private:
     void invalidateParagraphRangeValues();
     PassRefPtrWillBeRawPtr<Range> offsetAsRange() const;
 
+    bool isTextEmpty() const { return text().isEmpty(); }
+    bool isRangeEmpty() const { return checkingStart() >= checkingEnd(); }
+
     RefPtrWillBeMember<Range> m_checkingRange;
     mutable RefPtrWillBeMember<Range> m_paragraphRange;
     mutable RefPtrWillBeMember<Range> m_offsetAsRange;