Don't set lastError if chrome.dial.discoverNow() can't start.

chrome/browser/extensions/api/dial/dial_api.cc

 // Copyright (c) 2012 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/extensions/api/dial/dial_api.h"
 
 #include <vector>
 
 #include "base/time/time.h"
 #include "chrome/browser/extensions/api/dial/dial_api_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/dial.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_system.h"
 
 using base::TimeDelta;
 using content::BrowserThread;
 
 namespace {
 
-const char kDialServiceError[] = "Dial service error.";
-
 // How often to poll for devices.
 const int kDialRefreshIntervalSecs = 120;
 
 // We prune a device if it does not respond after this time.
 const int kDialExpirationSecs = 240;
 
 // The maximum number of devices retained at once in the registry.
 const size_t kDialMaxDevices = 256;
 
 }  // namespace
@@ skipping 122 matching lines @@
   return true;
 }
 
 void DialDiscoverNowFunction::Work() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   result_ = dial_->dial_registry()->DiscoverNow();
 }
 
 bool DialDiscoverNowFunction::Respond() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  if (!result_)
-    error_ = kDialServiceError;
-
   SetResult(new base::FundamentalValue(result_));
   return true;
 }
 
 }  // namespace api
 
 }  // namespace extensions