Get rid of AX_LINE_BREAKS attribute to improve performance.

ui/accessibility/ax_node_data.cc

Index: ui/accessibility/ax_node_data.cc
diff --git a/ui/accessibility/ax_node_data.cc b/ui/accessibility/ax_node_data.cc
index 0f04517978c944131f8cce87eaa8c12cb85f763c..06c55e923b2811757047b18591d0ff912aeb5db2 100644
--- a/ui/accessibility/ax_node_data.cc
+++ b/ui/accessibility/ax_node_data.cc
@@ -692,9 +692,6 @@ std::string AXNodeData::ToString() const {
       case AX_ATTR_LABELLEDBY_IDS:
         result += " labelledby_ids=" + IntVectorToString(values);
         break;
-      case AX_ATTR_LINE_BREAKS:
-        result += " line_breaks=" + IntVectorToString(values);
-        break;
       case AX_ATTR_MARKER_TYPES: {
         std::string types_str;
         for (size_t i = 0; i < values.size(); ++i) {
@@ -735,6 +732,9 @@ std::string AXNodeData::ToString() const {
       case AX_ATTR_CHARACTER_OFFSETS:
         result += " character_offsets=" + IntVectorToString(values);
         break;
+      case AX_ATTR_CACHED_LINE_STARTS:
+        result += " cached_line_start_offsets=" + IntVectorToString(values);
+        break;
       case AX_ATTR_WORD_STARTS:
         result += " word_starts=" + IntVectorToString(values);
         break;