message: Fix up syncservice remove.
  Fixes
diff: @@ -277,8 +277,8 @@ function SyncService($q, $translate) {
  return set(cached, true);
  }
  - return $q((resolve, reject) => {
  if (window.chrome && chrome.storage && chrome.storage.sync) {
  + return $q((resolve, reject) => {
  chrome.storage.sync.remove(key, () => {
  if (chrome.runtime.lastError) {
  reject(chrome.runtime.lastError);
  @@ -286,10 +286,10 @@ function SyncService($q, $translate) {
  resolve();
  }
  });
  + });
  } else {
  return set(cached, true);
  }
  - });
  }
  return {
  