[css-logical] Add back prefixed logical property in crashes.css

Most uses of the prefixed logical properties were replaced with the
standard ones, supported in Blink. However, they are not supported in
WebKit, this causes problems in iOS. This patch adds back the prefixed
property so that it's used as a fallback.

BUG=869879

Change-Id: Ic5076d10524f3e93994c72ff049d53daadea39d6
Reviewed-on: https://chromium-review.googlesource.com/1163887Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#583732}

components/crash/core/browser/resources/crashes.css

@@ -7,6 +7,7 @@ body {
 }
 
 h1 {
+  -webkit-padding-start: 75px;
   background-image: url(../../../../resources/sadtab.svg);
   background-position: left;
   background-repeat: no-repeat;