Browser: real download path can't match the displayed path

When download type is image/audio/video,will put them in corresponding
subfolder Pictures/Music/Movies not only in Download subfolder.So the
path can't match the displayed path.

Move the code change into Browser app.So that when user try to
download some file whose type is image/audio/video,download settings
will show the corresponding subfolder to let user download in.

CRs-Fixed: 539491

Change-Id: Ia5b77501d402bc02b7578a70bac7b6554278a671
4 files changed