For travis builds, switch off the container based builds as the GWT compiler gets killed frequently.
For travis builds, switch off the container based builds as the GWT compiler gets killed frequently.

Closes https://github.com/google/closure-compiler/pull/2147

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=139330990

ChadKillingsworth/closure-compiler,Dominator008/closure-compiler,MatrixFrog/closure-compiler,Pimm/closure-compiler,tdelmas/closure-compiler,shantanusharma/closure-compiler,nawawi/closure-compiler,brad4d/closure-compiler,google/closure-compiler,tdelmas/closure-compiler,monetate/closure-compiler,GerHobbelt/closure-compiler,MatrixFrog/closure-compiler,GerHobbelt/closure-compiler,Dominator008/closure-compiler,GerHobbelt/closure-compiler,anomaly/closure-compiler,google/closure-compiler,shantanusharma/closure-compiler,ChadKillingsworth/closure-compiler,anomaly/closure-compiler,Pimm/closure-compiler,Dominator008/closure-compiler,tiobe/closure-compiler,Pimm/closure-compiler,Yannic/closure-compiler,monetate/closure-compiler,mprobst/closure-compiler,ChadKillingsworth/closure-compiler,tiobe/closure-compiler,anomaly/closure-compiler,monetate/closure-compiler,nawawi/closure-compiler,monetate/closure-compiler,mprobst/closure-compiler,brad4d/closure-compiler,tiobe/closure-compiler,google/closure-compiler,vobruba-martin/closure-compiler,mprobst/closure-compiler,vobruba-martin/closure-compiler,ChadKillingsworth/closure-compiler,GerHobbelt/closure-compiler,mprobst/closure-compiler,MatrixFrog/closure-compiler,shantanusharma/closure-compiler,vobruba-martin/closure-compiler,nawawi/closure-compiler,shantanusharma/closure-compiler,tdelmas/closure-compiler,Yannic/closure-compiler,google/closure-compiler,tdelmas/closure-compiler,brad4d/closure-compiler,nawawi/closure-compiler,Yannic/closure-compiler,anomaly/closure-compiler,MatrixFrog/closure-compiler,tiobe/closure-compiler,Yannic/closure-compiler,vobruba-martin/closure-compiler