rust-toolchain: Dont error out during a failed removal of latest

Change-Id: Ibd243edafe3c3faa830e24f676a429d691bbaeee

manage-rust-toolchain.sh

diff --git a/manage-rust-toolchain.sh b/manage-rust-toolchain.sh
index 3a700f2..73f05e5 100755
--- a/manage-rust-toolchain.sh
+++ b/manage-rust-toolchain.sh
@@ -108,9 +108,9 @@
     local promote_date="$1"; shift
 
     echo "Removing old latest toolchain..."
-    try gsutil rm \
+    gsutil rm \
         "${PUBLIC_ARTIFACTS_PATH}/rust_toolchain_latest.tar.xz"
-    try gsutil rm \
+    gsutil rm \
         "${PUBLIC_ARTIFACTS_PATH}/rust_toolchain_latest.tar.xz.sha256sum"
 
     echo "Promoting tarball rust_toolchain_${promote_date}.tar.xz to rust_toolchain_latest.tar.xz"