Google sales get boost from movies, apps

San Francisco

GOOGLE Inc's decelerating advertising business is masking the stellar growth of significant but little-noticed business components such as sales of digital music, software and mobile devices.

On Thursday, Google reported weakening growth in ad volumes in the third quarter, fanning worries on Wall Street about the Internet company's efforts to adapt its business to a mobile landscape.

But one bright spot that analysts and investors say may bec…