Revert of Add error messsage bubble flag for tests.

chrome/browser/resources/login/display_manager.js

Index: chrome/browser/resources/login/display_manager.js
diff --git a/chrome/browser/resources/login/display_manager.js b/chrome/browser/resources/login/display_manager.js
index d6112674ce1f56e8521d6d8d5283b08d56bdbcf8..3644beb1321bd8ec27b9ef14fdf8739d24852fb2 100644
--- a/chrome/browser/resources/login/display_manager.js
+++ b/chrome/browser/resources/login/display_manager.js
@@ -177,11 +177,6 @@
      * @type {string}
      */
     displayType_: DISPLAY_TYPE.UNKNOWN,
-
-    /**
-     * Error message (bubble) was shown. This is checked in tests.
-     */
-    errorMessageWasShownForTesting_: false,
 
     get displayType() {
       return this.displayType_;
@@ -881,10 +876,8 @@
     }
 
     var currentScreen = Oobe.getInstance().currentScreen;
-    if (currentScreen && typeof currentScreen.showErrorBubble === 'function') {
+    if (currentScreen && typeof currentScreen.showErrorBubble === 'function')
       currentScreen.showErrorBubble(loginAttempts, error);
-      this.errorMessageWasShownForTesting_ = true;
-    }
   };
 
   /**
@@ -914,7 +907,6 @@
    */
   DisplayManager.clearErrors = function() {
     $('bubble').hide();
-    this.errorMessageWasShownForTesting_ = false;
   };
 
   /**