Revert 170590

content/public/browser/browser_accessibility_state.h

Index: content/public/browser/browser_accessibility_state.h
===================================================================
--- content/public/browser/browser_accessibility_state.h	(revision 170692)
+++ content/public/browser/browser_accessibility_state.h	(working copy)
@@ -5,7 +5,6 @@
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_
 
-#include "base/callback_forward.h"
 #include "content/common/content_export.h"
 
 namespace content {
@@ -28,12 +27,6 @@
 
   // Returns true if the browser should be customized for accessibility.
   virtual bool IsAccessibleBrowser() = 0;
-
-  // Add a callback method that will be called once, a small while after the
-  // browser starts up, when accessibility state histograms are updated.
-  // Use this to register a method to update additional accessibility
-  // histograms.
-  virtual void AddHistogramCallback(base::Closure callback) = 0;
 };
 
 }  // namespace content