Use multiline attribute to check for IA2_STATE_MULTILINE.

ui/accessibility/platform/ax_platform_node_mac.mm

 // Copyright 2014 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.
 
 #import "ui/accessibility/platform/ax_platform_node_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/strings/sys_string_conversions.h"
 #import "ui/accessibility/ax_node_data.h"
@@ skipping 101 matching lines @@
       {ui::AX_ROLE_SPLITTER, NSAccessibilitySplitterRole},
       {ui::AX_ROLE_STATIC_TEXT, NSAccessibilityStaticTextRole},
       {ui::AX_ROLE_STATUS, NSAccessibilityGroupRole},
       {ui::AX_ROLE_SVG_ROOT, NSAccessibilityGroupRole},
       {ui::AX_ROLE_SWITCH, NSAccessibilityCheckBoxRole},
       {ui::AX_ROLE_TAB, NSAccessibilityRadioButtonRole},
       {ui::AX_ROLE_TABLE, NSAccessibilityTableRole},
       {ui::AX_ROLE_TABLE_HEADER_CONTAINER, NSAccessibilityGroupRole},
       {ui::AX_ROLE_TAB_LIST, NSAccessibilityTabGroupRole},
       {ui::AX_ROLE_TAB_PANEL, NSAccessibilityGroupRole},
-      {ui::AX_ROLE_TEXT_AREA, NSAccessibilityTextAreaRole},
       {ui::AX_ROLE_TEXT_FIELD, NSAccessibilityTextFieldRole},
       {ui::AX_ROLE_TIME, @"AXTimeField"},
       {ui::AX_ROLE_TIMER, NSAccessibilityGroupRole},
       {ui::AX_ROLE_TOGGLE_BUTTON, NSAccessibilityCheckBoxRole},
       {ui::AX_ROLE_TOOLBAR, NSAccessibilityToolbarRole},
       {ui::AX_ROLE_TOOLTIP, NSAccessibilityGroupRole},
       {ui::AX_ROLE_TREE, NSAccessibilityOutlineRole},
       {ui::AX_ROLE_TREE_GRID, NSAccessibilityTableRole},
       {ui::AX_ROLE_TREE_ITEM, NSAccessibilityRowRole},
       {ui::AX_ROLE_WEB_AREA, @"AXWebArea"},
@@ skipping 200 matching lines @@
 void AXPlatformNodeMac::NotifyAccessibilityEvent(ui::AXEvent event_type) {
   // TODO(dmazzoni): implement this.  http://crbug.com/396137
 }
 
 int AXPlatformNodeMac::GetIndexInParent() {
   // TODO(dmazzoni): implement this.  http://crbug.com/396137
   return -1;
 }
 
 }  // namespace ui