[Sync UI] Disable the "Advanced..." button when there is an unrecoverable sync error.

chrome/browser/ui/webui/options/personal_options_handler.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/options/personal_options_handler.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 291 matching lines @@
                                   *label);
 
   enabled.reset(Value::CreateBooleanValue(!managed));
   web_ui_->CallJavascriptFunction("PersonalOptions.setSyncActionLinkEnabled",
                                   *enabled);
 
   visible.reset(Value::CreateBooleanValue(status_has_error));
   web_ui_->CallJavascriptFunction("PersonalOptions.setSyncStatusErrorVisible",
                                   *visible);
 
+  enabled.reset(Value::CreateBooleanValue(
+      !service->unrecoverable_error_detected()));
+  web_ui_->CallJavascriptFunction(
+      "PersonalOptions.setCustomizeSyncButtonEnabled",
+      *enabled);
+
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableAutologin)) {
     visible.reset(Value::CreateBooleanValue(
         service->AreCredentialsAvailable()));
     web_ui_->CallJavascriptFunction("PersonalOptions.setAutoLoginVisible",
                                     *visible);
   }
 
   // Set profile creation text and button if multi-profiles switch is on.
   visible.reset(Value::CreateBooleanValue(multiprofile_));
   web_ui_->CallJavascriptFunction("PersonalOptions.setProfilesSectionVisible",
@@ skipping 86 matching lines @@
     profile_info_list.Append(profile_value);
   }
 
   web_ui_->CallJavascriptFunction("PersonalOptions.setProfilesInfo",
                                   profile_info_list);
 }
 
 void PersonalOptionsHandler::CreateProfile(const ListValue* args) {
   ProfileManager::CreateMultiProfileAsync();
 }