Various cleanup

tool/transformer_test.sh

 #!/bin/bash
 set -eu
 cd $( dirname "${BASH_SOURCE[0]}" )/..
 
 export CHROME_CANARY_BIN=`./tool/get_chrome_canary.sh`
 
 # TODO(vsm): Re-enable when this is addressed:
 # https://github.com/dart-lang/dev_compiler/issues/467
 # echo "*** Testing pub serve + DDC transformer"
 # pub run test --timeout 120s test/transformer_e2e_test.dart
 # echo "*** Pub serve e2e test finished"
 
 echo "*** Testing pub build + DDC transformer"
 cd test/transformer/hello_app
+rm -f pubspec.lock
 pub get
 pub build
 echo "*** Pub build finished"
 
 expected_files=(
   build/web/hello_app/web/index.html
   build/web/hello_app/web/main.js
   build/web/hello_dep/simple.js
   build/web/hello_dep/utils.js
   # This is not an exhaustive check:
   build/web/dev_compiler/runtime/dart/_runtime.js
 )
 
 for file in "${expected_files[@]}" ; do
   if [[ ! -f $file ]]; then
     echo "Didn't find $file in build:"
     find build | grep -v /packages/
     exit 1
   fi
 done