Move everything under ui/ folder to ui namespace.

Eventually, we should move ipc/, ui/, desktop_aura/ to their own namespace
as rest of chromium code. This CL moves everything under ui/ folder to ui
namespace.
Move everything under desktop_aura/ to view namespace.
Move impl/desktop_aura/ to ui/

Fixes #209
Gardening: update to latest revision.

Effecting CL: https://codereview.chromium.org/180003006
Gardening: Remove temporary patch.