Gallery2: update content start/end once getUpdateinfo

When delete last picture in album , the album has changed,
but this time current index and content start/end is still
old value.

To aviod this situation, will update content start and content end
once after getUpdateinfo and then can get correct current index and
item path.

CRs-Fixed: 624471

Change-Id: I8eb92e685f321df2d11481f440f7d9d33cf7b820
Merge "Gallery2: update content start/end once getUpdateinfo" into du44