[iOS][Omnibox][M111] Fix row trailing constraint

Fix trailing anchor constraint.
stackView.trailing = contentView.trailing - constant
instead of
stackView.trailing = contentView.trailing + constant

(cherry picked from commit 04b2c64)

Bug: 1411903
Change-Id: Ia84c1c0b95633cc90f8adf034bb800f37de9aa5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4212389
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Auto-Submit: Christian Xu <christianxu@chromium.org>
Commit-Queue: Christian Xu <christianxu@chromium.org>
Reviewed-by: Ewann Pellé <ewannpv@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1100006}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4219100
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/branch-heads/5563@{chromium#145}
Cr-Branched-From: 3ac59a6-refs/heads/main@{#1097615}

ios/chrome/browser/ui/omnibox/popup/omnibox_popup_row_cell.mm

@@ -332,12 +332,12 @@ - (void)attachToLayoutGuides {
   DCHECK(self.imageLayoutGuide);
   DCHECK(self.textLayoutGuide);
 
-  // The text should extend to the cell's trailing edge when there is no
-  // trailing button.
+  // When there is no trailing button, the text should extend to the cell's
+  // trailing edge with a padding.
   NSLayoutConstraint* stackViewToCellTrailing =
       [self.textStackView.trailingAnchor
           constraintEqualToAnchor:self.contentView.trailingAnchor
-                         constant:kTextTrailingMargin];
+                         constant:-kTextTrailingMargin];
   stackViewToCellTrailing.priority = UILayoutPriorityDefaultHigh;
   self.textTrailingConstraint = stackViewToCellTrailing;