Revert "check the branch flags (#18649)" (#18654)

This reverts commit fbddcd3023be893d7fed946b6729c86e701a23cb.
diff --git a/tools/clone_flutter.sh b/tools/clone_flutter.sh
index 198d74d..884de99 100755
--- a/tools/clone_flutter.sh
+++ b/tools/clone_flutter.sh
@@ -18,8 +18,6 @@
 cd $ENGINE_PATH/src/flutter
 
 # Special handling of release branches.
-echo "CIRRUS_BASE_BRANCH $CIRRUS_BASE_BRANCH and CIRRUS_BRANCH $CIRRUS_BRANCH and CIRRUS_DEFAULT_BRANCH $CIRRUS_DEFAULT_BRANCH"
-
 ENGINE_BRANCH_NAME=$CIRRUS_BASE_BRANCH
 versionregex="^v[[:digit:]]+\."
 releasecandidateregex="^flutter-[[:digit:]]+\.[[:digit:]]+-candidate\.[[:digit:]]+$"