Fix negative size when size is greater than 2,147,483,647

Java integer max is 2,147,483,647, it's about 2GB.
Use getLong to get size from provider instead of getInt.

Bug: 190721008
Test: manual visual
      Copy video files more than 2,147,483,647 bytes
      and observe Videos size information.
Change-Id: Ic804db43554fdd580627faebecfe30d9ad2a9120