Get rid of AX_LINE_BREAKS attribute to improve performance.

ui/accessibility/ax_tree_combiner.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/accessibility/ax_tree.h"
 #include "ui/accessibility/ax_tree_combiner.h"
 #include "ui/gfx/geometry/rect_f.h"
 
 namespace ui {
 namespace {
@@ skipping 64 matching lines @@
     case AX_ATTR_INDIRECT_CHILD_IDS:
     case AX_ATTR_LABELLEDBY_IDS:
     case AX_ATTR_UNIQUE_CELL_IDS:
       return true;
 
     // Note: all of the attributes are included here explicitly,
     // rather than using "default:", so that it's a compiler error to
     // add a new attribute without explicitly considering whether it's
     // a node id attribute or not.
     case AX_INT_LIST_ATTRIBUTE_NONE:
-    case AX_ATTR_LINE_BREAKS:
     case AX_ATTR_MARKER_TYPES:
     case AX_ATTR_MARKER_STARTS:
     case AX_ATTR_MARKER_ENDS:
     case AX_ATTR_CHARACTER_OFFSETS:
+    case AX_ATTR_CACHED_LINE_STARTS:
     case AX_ATTR_WORD_STARTS:
     case AX_ATTR_WORD_ENDS:
       return false;
   }
 
   NOTREACHED();
   return false;
 }
 
 }  // namespace
@@ skipping 135 matching lines @@
     // Recurse into the child tree now, if any.
     if (child_tree)
       ProcessTree(child_tree);
   }
 
   // Reset the transform.
   transform_ = old_transform;
 }
 
 }  // namespace ui