MD User Manager: Clear existing error messages before browser calls

chrome/browser/resources/md_user_manager/create_profile.js

Index: chrome/browser/resources/md_user_manager/create_profile.js
diff --git a/chrome/browser/resources/md_user_manager/create_profile.js b/chrome/browser/resources/md_user_manager/create_profile.js
index 8f5a151ac19788caea00da8ec331dea897d069f4..4295fc2eb1473caa58ee3e57733445ab63128e67 100644
--- a/chrome/browser/resources/md_user_manager/create_profile.js
+++ b/chrome/browser/resources/md_user_manager/create_profile.js
@@ -219,6 +219,7 @@ Polymer({
       this.handleMessage_(this.i18n('custodianAccountNotSelectedError'));
     } else {
       var signedInUser = this.signedInUser_(this.signedInUserIndex_);
+      this.clearMessage_();
       this.createInProgress_ = true;
       this.browserProxy_.getExistingSupervisedUsers(signedInUser.profilePath)
           .then(this.showImportSupervisedUserPopup_.bind(this),
@@ -240,6 +241,7 @@ Polymer({
       this.handleMessage_(this.i18n('custodianAccountNotSelectedError'));
     } else {
       var signedInUser = this.signedInUser_(this.signedInUserIndex_);
+      this.clearMessage_();
       this.createInProgress_ = true;
       this.browserProxy_.getExistingSupervisedUsers(signedInUser.profilePath)
           .then(this.createProfileIfValidSupervisedUser_.bind(this),
@@ -326,6 +328,7 @@ Polymer({
       custodianProfilePath =
           this.signedInUser_(this.signedInUserIndex_).profilePath;
     }
+    this.clearMessage_();
     this.createInProgress_ = true;
     this.browserProxy_.createProfile(
         this.profileName_, this.profileIconUrl_, this.isSupervised_, '',
@@ -342,6 +345,7 @@ Polymer({
   onImportUserPopupImport_: function(event) {
     var supervisedUser = event.detail.supervisedUser;
     var signedInUser = event.detail.signedInUser;
+    this.clearMessage_();
     this.createInProgress_ = true;
     this.browserProxy_.createProfile(
         supervisedUser.name, supervisedUser.iconURL, true, supervisedUser.id,
@@ -396,6 +400,14 @@ Polymer({
   },
 
   /**
+   * Clears the warning/error message.
+   * @private
+   */
+  clearMessage_: function() {
+    this.message_ = '';
+  },
+
+  /**
    * Handles profile create/import warning/error message pushed by the browser.
    * @param {*} message An HTML warning/error message.
    * @private