root/content/public/android/java/src/org/chromium/content/browser/accessibility/

[..]
  1. AccessibilityInjector.java
  2. BrowserAccessibilityManager.java
  3. JellyBeanAccessibilityInjector.java
  4. JellyBeanBrowserAccessibilityManager.java
  5. KitKatBrowserAccessibilityManager.java
[..]