DevTools: Correct ServiceDispatcher's error reporting

Change-Id: Ifd79d5b1889cbb657995efe4081ee8373664fcb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1119115
Commit-Queue: Paul Irish <paulirish@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641387}
1 file changed