Revert 170590

content/browser/accessibility/browser_accessibility_state_impl.h

Index: content/browser/accessibility/browser_accessibility_state_impl.h
===================================================================
--- content/browser/accessibility/browser_accessibility_state_impl.h	(revision 170692)
+++ content/browser/accessibility/browser_accessibility_state_impl.h	(working copy)
@@ -5,8 +5,6 @@
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_STATE_IMPL_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_STATE_IMPL_H_
 
-#include <vector>
-
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/singleton.h"
@@ -43,7 +41,6 @@
   virtual void OnAccessibilityEnabledManually() OVERRIDE;
   virtual void OnScreenReaderDetected() OVERRIDE;
   virtual bool IsAccessibleBrowser() OVERRIDE;
-  virtual void AddHistogramCallback(base::Closure callback) OVERRIDE;
 
   // Called a short while after startup to allow time for the accessibility
   // state to be determined. Updates a histogram with the current state.
@@ -63,8 +60,6 @@
 
   AccessibilityMode accessibility_mode_;
 
-  std::vector<base::Closure> histogram_callbacks_;
-
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityStateImpl);
 };