[cleanup] Java is on path, no need for JAVA_HOME.

.travis.yml

@@ -83,8 +83,6 @@ default_test_config: &default_test_config
   python: &python_version "2.7"
   before_install:
     - PATH=$(echo "$PATH" | sed -e 's/:\/usr\/local\/lib\/jvm\/openjdk11\/bin//')
-    - JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64
-    - ls /usr/local/lib/jvm
     # Increase the max number of user watches to ensure that watchman is able to watch all
     # files in the working copy.
     - sudo sysctl fs.inotify.max_user_watches=524288
@@ -103,7 +101,6 @@ default_cron_test_config: &default_cron_test_config
 linux_with_fuse: &linux_with_fuse
   before_install:
     - PATH=$(echo "$PATH" | sed -e 's/:\/usr\/local\/lib\/jvm\/openjdk11\/bin//')
-    - JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64
     - sudo apt-get install -y pkg-config fuse libfuse-dev
     - sudo modprobe fuse
     - sudo chmod 666 /dev/fuse