Full HD width is 1920.

BUG=794061
TEST=no NOTREACHED() from display_manager_utilities.cc on FullHD Chromebooks.

Change-Id: I473526931a9b1bba69c7885a4da0897d8ccd4898
Reviewed-on: https://chromium-review.googlesource.com/821791Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Kazuhiro Inaba <kinaba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523636}

ui/display/manager/display_manager_utilities.cc

@@ -74,7 +74,7 @@ DisplayUIScales GetScalesForDisplay(const ManagedDisplayMode& native_mode) {
       ASSIGN_ARRAY(ret.scales, kUIScalesFor1366);
       ret.default_scale = kDefaultUIScaleFor1366;
       break;
-    case 1980:
+    case 1920:
       ASSIGN_ARRAY(ret.scales, kUIScalesForFHD);
       ret.default_scale = kDefaultUIScaleForFHD;
       break;