am b2ac4991: Merge "Use the system downloads UI, instead of browser specific 1." into gingerbread

Merge commit 'b2ac49918672f66b71111895cf460e85648b587f' into gingerbread-plus-aosp

* commit 'b2ac49918672f66b71111895cf460e85648b587f':
  Use the system downloads UI, instead of browser specific 1.