Get rid of AX_LINE_BREAKS attribute to improve performance.

content/browser/accessibility/browser_accessibility.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 326 matching lines @@
   bool IsMenuRelated() const;
   bool IsNativeTextControl() const;
   bool IsSimpleTextControl() const;
   // Indicates if this object is at the root of a rich edit text control.
   bool IsRichTextControl() const;
 
   // If an object is focusable but has no accessible name, use this
   // to compute a name from its descendants.
   std::string ComputeAccessibleNameFromDescendants();
 
+  // Gets the text offsets where new lines start.
+  std::vector<int> GetLineStartOffsets() const;
+
  protected:
   BrowserAccessibility();
 
   // The manager of this tree of accessibility objects.
   BrowserAccessibilityManager* manager_;
 
   // The underlying node.
   ui::AXNode* node_;
 
   // A unique ID, since node IDs are frame-local.
@@ skipping 17 matching lines @@
   // page coordinates (when |frameOnly| is false), or in frame coordinates
   // (when |frameOnly| is true).
   gfx::Rect RelativeToAbsoluteBounds(gfx::RectF bounds, bool frame_only) const;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_