[Multipaste] Extra padding between text and the delete button

As demonstrated by the specs, there should be an 8-pixel gap between the
text and the delete button.

Bug: 1131731
Change-Id: Iedcc98ba4253d10ec3acdf828f6d5eab21d6ee47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523370
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Auto-Submit: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#825035}

ash/clipboard/views/clipboard_history_text_item_view.cc

@@ -23,7 +23,7 @@ constexpr int kLabelPreferredHeight = 16;
 
 // The margins of the delete button.
 constexpr gfx::Insets kDeleteButtonMargins =
-    gfx::Insets(/*top=*/0, /*left=*/0, /*bottom=*/0, /*right=*/4);
+    gfx::Insets(/*top=*/0, /*left=*/8, /*bottom=*/0, /*right=*/4);
 }  // namespace
 
 namespace ash {