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
  explicit DummyBrightnessControlDelegate(bool consume)
      : consume_(consume),
        handle_brightness_down_count_(0),
        handle_brightness_up_count_(0) {
  }

  explicit DummyBrightnessControlDelegate(bool consume)
      : consume_(consume),
        handle_brightness_down_count_(0),
        handle_brightness_up_count_(0) {
  }
