[ios] Fix layout in GridCell

Previously, a long title would bump the close button
off the edge of the cell. This change allows the title
to be compressed.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I10d88d9e90f24cd4051d1cc0161801fe6d11ae32
Reviewed-on: https://chromium-review.googlesource.com/962939Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543145}

ios/chrome/browser/ui/tab_grid/grid_cell.mm

@@ -233,8 +233,9 @@ const CGFloat kBorderWidth = 6.0f;
                                                constant:-6.0f],
   ];
   [NSLayoutConstraint activateConstraints:constraints];
-  [closeButton setContentHuggingPriority:UILayoutPriorityDefaultHigh
-                                 forAxis:UILayoutConstraintAxisHorizontal];
+  [titleLabel
+      setContentCompressionResistancePriority:UILayoutPriorityDefaultLow
+                                      forAxis:UILayoutConstraintAxisHorizontal];
   return topBar;
 }