Use the right TextRun length when checking for surrogate pairs

third_party/WebKit/Source/core/layout/svg/SVGTextMetricsBuilder.cpp

Index: third_party/WebKit/Source/core/layout/svg/SVGTextMetricsBuilder.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/SVGTextMetricsBuilder.cpp b/third_party/WebKit/Source/core/layout/svg/SVGTextMetricsBuilder.cpp
index 82557fd256b0ee7a5c9c215f0f728d91cb41f306..49681b6edbef7b8000c81ddb46a569901be0dc1b 100644
--- a/third_party/WebKit/Source/core/layout/svg/SVGTextMetricsBuilder.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/SVGTextMetricsBuilder.cpp
@@ -40,7 +40,7 @@ inline bool characterStartsSurrogatePair(const TextRun& run, unsigned index)
 {
     if (!U16_IS_LEAD(run[index]))
         return false;
-    if (index + 1 >= static_cast<unsigned>(run.charactersLength()))
+    if (index + 1 >= static_cast<unsigned>(run.length()))
         return false;
     return U16_IS_TRAIL(run[index + 1]);
 }