[tools/vim/clang-format] Remove spurious echo BUG=none NOTRY=true Review URL: https://codereview.chromium.org/523673002 Cr-Original-Commit-Position: refs/heads/master@{#292651} Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: 4a2f312f83920a43d1236b04aad956a67080c5ec