Reduced the callers to the non-const version of CSSValueList::item()

third_party/WebKit/Source/core/css/CSSValueList.h

Index: third_party/WebKit/Source/core/css/CSSValueList.h
diff --git a/third_party/WebKit/Source/core/css/CSSValueList.h b/third_party/WebKit/Source/core/css/CSSValueList.h
index 47f8c24b741d42e6369ee7c7b34aafadd2f63de7..cb1e32b81e7a837591c8f9a367624fa2a7671a1b 100644
--- a/third_party/WebKit/Source/core/css/CSSValueList.h
+++ b/third_party/WebKit/Source/core/css/CSSValueList.h
@@ -53,8 +53,10 @@ public:
     const_iterator end() const { return m_values.end(); }
 
     size_t length() const { return m_values.size(); }
+    // TODO(sashab): Remove the non-const item() method.
     CSSValue* item(size_t index) { return m_values[index].get(); }
     const CSSValue* item(size_t index) const { return m_values[index].get(); }
+    // TODO(sashab): Remove these methods.
     CSSValue* itemWithBoundsCheck(size_t index) { return index < m_values.size() ? m_values[index].get() : nullptr; }
     const CSSValue* itemWithBoundsCheck(size_t index) const { return index < m_values.size() ? m_values[index].get() : nullptr; }