Remove trailing whitespace. This whitespace inside a string is ignored by our presubmit but WebKit's doesn't like it. Bug: angleproject:5351 Change-Id: I8385c9a49332a92ce16b170bc1a22408bd387f30 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2541823 Commit-Queue: James Darpinian <jdarpinian@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>