Cleanups in ScreenOrientationDispatcherHost.

BUG=None

Review URL: https://codereview.chromium.org/408213003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284786 0039d316-1c4b-4281-b951-d872f2087c98
ScreenOrientationDispatcherHost::~ScreenOrientationDispatcherHost() {
  ResetCurrentLock();
}

ScreenOrientationDispatcherHost::~ScreenOrientationDispatcherHost() {
  ResetCurrentLock();
}
