Revert 170590

content/browser/accessibility/browser_accessibility_state_impl.cc

Index: content/browser/accessibility/browser_accessibility_state_impl.cc
===================================================================
--- content/browser/accessibility/browser_accessibility_state_impl.cc	(revision 170692)
+++ content/browser/accessibility/browser_accessibility_state_impl.cc	(working copy)
@@ -80,17 +80,9 @@
   return (accessibility_mode_ == AccessibilityModeComplete);
 }
 
-void BrowserAccessibilityStateImpl::AddHistogramCallback(
-    base::Closure callback) {
-  histogram_callbacks_.push_back(callback);
-}
-
 void BrowserAccessibilityStateImpl::UpdateHistogram() {
   UpdatePlatformSpecificHistograms();
 
-  for (size_t i = 0; i < histogram_callbacks_.size(); ++i)
-    histogram_callbacks_[i].Run();
-
   UMA_HISTOGRAM_BOOLEAN("Accessibility.State", IsAccessibleBrowser());
   UMA_HISTOGRAM_BOOLEAN("Accessibility.InvertedColors",
                         gfx::IsInvertedColorScheme());