Remove KeyboardUmaEventFilter

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index 23c849be76d7a5b9e1251dce640ddb4c97112574..9f661f0577328867b8f90fd616353abfe7f62610 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -95,7 +95,6 @@ class EventTransformationHandler;
 class FirstRunHelper;
 class GPUSupport;
 class HighContrastController;
-class KeyboardUMAEventFilter;
 class LinkHandlerModelFactory;
 class LocaleNotificationController;
 class LockStateController;
@@ -588,9 +587,6 @@ class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
   // screenshot UI or the keyboard overlay is active.
   std::unique_ptr<OverlayEventFilter> overlay_filter_;
 
-  // An event filter for logging keyboard-related metrics.
-  std::unique_ptr<KeyboardUMAEventFilter> keyboard_metrics_filter_;
-
   // An event filter which handles moving and resizing windows.
   std::unique_ptr<ToplevelWindowEventHandler> toplevel_window_event_handler_;