Remove incorrect image/svg+xml MAGIC_NUMBER

The MIME sniffing code that inspects the start of a content
stream uses arrays of magic numbers with the expected MIME
type when trying to work out the correct type.

This CL removes the magic number that matched an incorrect
XML start pattern that incorrectly identifies an SVG file.

       this to re-appear.

Bug: 940336
Tests: Manually checked in ChromeOS File Viewer, don't expect
Change-Id: I34daf5662202999deaf1087f27b786bba7d5e2c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1525581
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641463}
1 file changed