Bug 1613985 - Use default for equivalent-to-default constructors/destructors in accessibility. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D62569

--HG--
extra : moz-landing-system : lando

accessible/base/DocManager.h

@@ -116,7 +116,7 @@ class DocManager : public nsIWebProgressListener,
 
  protected:
   DocManager();
-  virtual ~DocManager() {}
+  virtual ~DocManager() = default;
 
   /**
    * Initialize the manager.

accessible/xpcom/xpcAccessibilityService.h

@@ -35,7 +35,7 @@ class xpcAccessibilityService : public nsIAccessibilityService {
  private:
   // xpcAccessibilityService creation is controlled by friend
   // NS_GetAccessibilityService, keep constructor private.
-  xpcAccessibilityService(){};
+  xpcAccessibilityService() = default;
 
   nsCOMPtr<nsITimer> mShutdownTimer;