Googletest export

Update Travis CI to use Ubuntu Bionic in some cases

PiperOrigin-RevId: 313639562

ci/env-linux.sh

@@ -36,6 +36,6 @@
 # TODO() - we can check if this is being sourced using $BASH_VERSION and $BASH_SOURCE[0] != ${0}.
 
 if [ "${TRAVIS_OS_NAME}" = "linux" ]; then
-    if [ "$CXX" = "g++" ]; then export CXX="g++-4.9" CC="gcc-4.9"; fi
-    if [ "$CXX" = "clang++" ]; then export CXX="clang++-3.9" CC="clang-3.9"; fi
+    if [ "$CXX" = "g++" ]; then export CXX="g++" CC="gcc"; fi
+    if [ "$CXX" = "clang++" ]; then export CXX="clang++" CC="clang"; fi
 fi