Chrome Empties: Use Subheadline instead of Footnote

Subtitles should use the Subheadline Font Style instead of Footnote, which is a little too small.

Bug: 1098328
Change-Id: I4ffe669b9709fbd8143d00c1f16a393b723c5160
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341172Reviewed-by: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Maxime Charland <mcharland@google.com>
Cr-Commit-Position: refs/heads/master@{#795901}

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

@@ -119,7 +119,12 @@ const CGFloat kImageWidth = 150.0;
   bottomLabel.translatesAutoresizingMaskIntoConstraints = NO;
   bottomLabel.text = self.body;
   bottomLabel.textColor = UIColorFromRGB(kTabGridEmptyStateBodyTextColor);
-  bottomLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
+  if (base::FeatureList::IsEnabled(kIllustratedEmptyStates)) {
+    bottomLabel.font =
+        [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline];
+  } else {
+    bottomLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
+  }
   bottomLabel.adjustsFontForContentSizeCategory = YES;
   bottomLabel.numberOfLines = 0;
   bottomLabel.textAlignment = NSTextAlignmentCenter;

ios/chrome/browser/ui/table_view/cells/table_view_illustrated_item.mm

@@ -107,7 +107,7 @@ const CGFloat kButtonCornerRadius = 8.0;
     _subtitleLabel = [[UILabel alloc] init];
     _subtitleLabel.textColor = [UIColor colorNamed:kTextSecondaryColor];
     _subtitleLabel.font =
-        [UIFont preferredFontForTextStyle:UIFontTextStyleFootnote];
+        [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline];
     _subtitleLabel.textAlignment = NSTextAlignmentCenter;
     _subtitleLabel.numberOfLines = 0;
     _subtitleLabel.translatesAutoresizingMaskIntoConstraints = NO;

ios/chrome/browser/ui/table_view/table_view_illustrated_empty_view.mm

@@ -124,7 +124,7 @@ const CGFloat kImageHeightPt = 150.0;
     subtitleLabel.numberOfLines = 0;
     subtitleLabel.text = self.subtitle;
     subtitleLabel.font =
-        [UIFont preferredFontForTextStyle:UIFontTextStyleFootnote];
+        [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline];
     subtitleLabel.textColor = [UIColor colorNamed:kTextSecondaryColor];
     subtitleLabel.textAlignment = NSTextAlignmentCenter;
     [subviewsArray addObject:subtitleLabel];