Revert of Revert of Clean up Smart Lock cryptohome keys logic:

chrome/browser/signin/easy_unlock_service.h

Index: chrome/browser/signin/easy_unlock_service.h
diff --git a/chrome/browser/signin/easy_unlock_service.h b/chrome/browser/signin/easy_unlock_service.h
index 06915e75896e4dc92c9aa108a878067495b3a76d..713986b03e4803c058810ea5af265df6419d65a5 100644
--- a/chrome/browser/signin/easy_unlock_service.h
+++ b/chrome/browser/signin/easy_unlock_service.h
@@ -83,10 +83,9 @@
   virtual void SetPermitAccess(const base::DictionaryValue& permit) = 0;
   virtual void ClearPermitAccess() = 0;
 
-  // Gets/Sets/Clears the remote devices list.
+  // Gets/Sets the remote devices list.
   virtual const base::ListValue* GetRemoteDevices() const = 0;
   virtual void SetRemoteDevices(const base::ListValue& devices) = 0;
-  virtual void ClearRemoteDevices() = 0;
 
   // Runs the flow for turning Easy unlock off.
   virtual void RunTurnOffFlow() = 0;