Removing unneeded dependency install line.

.travis.yml

@@ -37,8 +37,6 @@ matrix:
 
     - env: CMAKE_BUILD_TYPE=Debug COVERAGE_ENABLED=True
       after_success:
-        - docker exec --interactive --tty -e CODECOV_TOKEN nav2_bash bash -c
-            "apt-get update ; apt-get -y install lcov"
         - ci_env=`bash <(curl -s https://codecov.io/env)`
         - docker exec --interactive --tty $ci_env nav2_bash /ros_entrypoint.sh
             src/navigation2/tools/code_coverage_report.bash codecovio

nav2_system_tests/package.xml

@@ -42,6 +42,7 @@
   <exec_depend>launch_ros</exec_depend>
   <exec_depend>launch_testing</exec_depend>
   <exec_depend>navigation2</exec_depend>
+  <exec_depend>lcov</exec_depend>
 
   <test_depend>launch_ros</test_depend>
   <test_depend>launch_testing</test_depend>