Remove these files from BUILD.gn
Remove these files from BUILD.gn

They no longer exist but I forgot to remove them in my previous CL.

TBR=ianh@google.com

Review URL: https://codereview.chromium.org/1192603003.

afandria/mojo,afandria/mojo,chinmaygarde/mojo,jianglu/mojo,chinmaygarde/mojo,afandria/mojo,chinmaygarde/mojo,jianglu/mojo,chinmaygarde/mojo,chinmaygarde/mojo,jianglu/mojo,afandria/mojo,chinmaygarde/mojo,afandria/mojo,jianglu/mojo,jianglu/mojo,jianglu/mojo,afandria/mojo,jianglu/mojo,afandria/mojo,chinmaygarde/mojo,jianglu/mojo,chinmaygarde/mojo,chinmaygarde/mojo,afandria/mojo