accelerators: Remove deprecated Accelerator ctor that takes booleans.

BUG=128242
R=ben@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10399085

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137957 0039d316-1c4b-4281-b951-d872f2087c98
  int handle_brightness_up_count() const {
    return handle_brightness_up_count_;
  }

  int handle_brightness_up_count() const {
    return handle_brightness_up_count_;
  }
