Add namespace to accessbility's TkResMgr.

Previously this conflicted with include/toolkit/helper/tkresmgr.hxx,
breaking the Android build.

Change-Id: I195e18e42a5978fd7d415a8afaa007b3bee33190
Signed-off-by: Stephan Bergmann <sbergman@redhat.com>
Remove unused parts of TkResMgr

Change-Id: I33f6bb8756a3bab054068a73c8e3d71b414ddfe0