Fixed bugs with finding line boundaries using IA2 get_textAtOffset and AXPosition::AtStartOfLine.

content/browser/accessibility/browser_accessibility_com_win.h

 // Copyright (c) 2017 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_COM_WIN_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_COM_WIN_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <oleacc.h>
@@ skipping 858 matching lines @@
   // If offset is a member of IA2TextSpecialOffsets this function updates the
   // value of offset and returns, otherwise offset remains unchanged.
   void HandleSpecialTextOffset(LONG* offset);
 
   // Convert from a IA2TextBoundaryType to a ui::TextBoundaryType.
   ui::TextBoundaryType IA2TextBoundaryToTextBoundary(IA2TextBoundaryType type);
 
   // Search forwards (direction == 1) or backwards (direction == -1)
   // from the given offset until the given boundary is found, and
   // return the offset of that boundary.
-  LONG FindBoundary(const base::string16& text,
-                    IA2TextBoundaryType ia2_boundary,
+  LONG FindBoundary(IA2TextBoundaryType ia2_boundary,
                     LONG start_offset,
                     ui::TextBoundaryDirection direction);
 
   // Searches forward from the given offset until the start of the next style
   // is found, or searches backward from the given offset until the start of the
   // current style is found.
   LONG FindStartOfStyle(LONG start_offset,
                         ui::TextBoundaryDirection direction) const;
 
   // ID refers to the node ID in the current tree, not the globally unique ID.
@@ skipping 89 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityComWin);
 };
 
 CONTENT_EXPORT BrowserAccessibilityComWin* ToBrowserAccessibilityComWin(
     BrowserAccessibility* obj);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_COM_WIN_H_