Local NTP: make promo max-width slightly wider

R=mahmadi@chromium.org
BUG=969062

Change-Id: Ib07f2a73193cd72f5703315a886c222b7ec7a56e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808322
Auto-Submit: Dan Beam <dbeam@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697309}

chrome/browser/resources/local_ntp/local_ntp.css

@@ -754,7 +754,13 @@ html[dir=rtl] #error-notice.has-link #error-notice-msg {
   font-size: 12px;
   line-height: 32px;
   margin-bottom: 0;
-  max-width: 505px;
+  /* TODO(crbug.com/969062): this magic constant would be better implemented as
+   * real multi-line promo text support or a better QA process to check that
+   * promo messages aren't ellided. It's ultimately quite hard to make any pixel
+   * value here useful as font face, sizes, and zoom can all vary. Pushing for
+   * a more dynamic UI or better qualification process has been met with
+   * significant resistance, so we keep arbitrarily changing this value. */
+  max-width: 537px;
   overflow: hidden;
   padding: 0 16px;
   pointer-events: all;