Fix top row view-source gutter for small source content

Prior to this CL, the top "Line wrap" row could sometimes not
extend to the edge of the page, which looked odd. This CL makes
the min-width of the table 100vw, to make sure it extends to the
edge of the page.

Fixed: 1158345
Change-Id: I8119f5fe2e3b05183c349a4017ba28bf77d3c451
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589361
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836666}

third_party/blink/renderer/core/css/view-source.css

@@ -28,6 +28,7 @@ body {
 
 table {
     width: max-content;
+    min-width: 100vw;
     border-spacing: 0;
     white-space: pre;
     margin: 0;