Use the correct namespace for tr1 references.
Use the correct namespace for tr1 references.

Change-Id: I130bf9a7c811a2ec14425e007108279e60296035

kartikkumar/ceres-solver,DougFirErickson/ceres-solver,ysonggit/ceres-solver,jmwalls/ceres-solver-fork,arnaudgelas/ceres-solver,stonier/ceres_solver,DougFirErickson/ceres-solver,DougFirErickson/ceres-solver,jmwalls/ceres-solver-fork,timfel/ceres-bin,whuaegeanse/ceres-solver,entylop/ceres-solver,kartikkumar/ceres-solver,arnaudgelas/ceres-solver,stonier/ceres_solver,entylop/ceres-solver,timfel/ceres-bin,whuaegeanse/ceres-solver,ysonggit/ceres-solver,whuaegeanse/ceres-solver,arnaudgelas/ceres-solver,timfel/ceres-bin,kartikkumar/ceres-solver,entylop/ceres-solver,ikoruk/ceres-solver,jmwalls/ceres-solver-fork,ikoruk/ceres-solver,ikoruk/ceres-solver,ikoruk/ceres-solver,ysonggit/ceres-solver,stonier/ceres_solver,entylop/ceres-solver,jmwalls/ceres-solver-fork,whuaegeanse/ceres-solver,stonier/ceres_solver,kartikkumar/ceres-solver,ysonggit/ceres-solver,ikoruk/ceres-solver,timfel/ceres-bin,DougFirErickson/ceres-solver