Add a new GetInstance() method for remaining files with singleton classes under chrome/browser.

chrome/browser/accessibility/browser_accessibility_state.cc

 // Copyright (c) 2010 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 "chrome/browser/accessibility/browser_accessibility_state.h"
 #include "chrome/browser/profiles/profile.h"
 
 BrowserAccessibilityState::BrowserAccessibilityState()
     : screen_reader_active_(false) {
 }
 
 BrowserAccessibilityState::~BrowserAccessibilityState() {
 }
 
+// static
+BrowserAccessibilityState* BrowserAccessibilityState::GetInstance() {
+  return Singleton<BrowserAccessibilityState>::get();
+}
+
 void BrowserAccessibilityState::OnScreenReaderDetected() {
   screen_reader_active_ = true;
 }
 
 bool BrowserAccessibilityState::IsAccessibleBrowser() {
   return screen_reader_active_;
 }