chrome://settings should allow duplicate profile names.

chrome/browser/resources/options/manage_profile_overlay.js

Index: chrome/browser/resources/options/manage_profile_overlay.js
diff --git a/chrome/browser/resources/options/manage_profile_overlay.js b/chrome/browser/resources/options/manage_profile_overlay.js
index 0a4a5b56a41140dfe9fb2514d22ce28d154cb693..7cf21c4014d27f0b4f50c5e9cacc3f33b580f852 100644
--- a/chrome/browser/resources/options/manage_profile_overlay.js
+++ b/chrome/browser/resources/options/manage_profile_overlay.js
@@ -438,19 +438,10 @@ cr.define('options', function() {
     updateOkButton_: function(mode) {
       var oldName = this.profileInfo_.name;
       var newName = $(mode + '-profile-name').value;
-      var nameIsDuplicate = this.existingProfileNames_[newName] != undefined;
-      if (mode == 'manage' && oldName == newName)
-        nameIsDuplicate = false;
-      if (nameIsDuplicate) {
-        var errorHtml =
-            loadTimeData.getString('manageProfilesDuplicateNameError');
-        this.showErrorBubble_(errorHtml, mode, true);
-      } else {
-        this.hideErrorBubble_(mode);
+      this.hideErrorBubble_(mode);
 
-        var nameIsValid = $(mode + '-profile-name').validity.valid;
-        $(mode + '-profile-ok').disabled = !nameIsValid;
-      }
+      var nameIsValid = $(mode + '-profile-name').validity.valid;
+      $(mode + '-profile-ok').disabled = !nameIsValid;
     },
 
     /**