[iOS] Fixes TOS tap responding on iOS13

On iOS 13.1 the whole  TOS string  responds to a TAP.
On iOS 13.5, it works as expected.

Bug: 1102996
Change-Id: I8f72200964ed28dad7de52d9029fb14f97725e01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336609Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794938}

ios/chrome/browser/ui/first_run/welcome_to_chrome_view.mm

@@ -341,7 +341,7 @@ const char kTermsOfServiceUrl[] = "internal://terms-of-service";
   [self addSubview:self.containerView];
   [self.containerView addSubview:self.titleLabel];
   [self.containerView addSubview:self.imageView];
-  if (@available(iOS 13.0, *)) {
+  if (@available(iOS 13.5, *)) {
     [self.containerView addSubview:self.TOSTextView];
   } else {
     [self.containerView addSubview:self.legacyTOSLabel];
@@ -361,7 +361,7 @@ const char kTermsOfServiceUrl[] = "internal://terms-of-service";
   [super layoutSubviews];
   [self layoutTitleLabel];
   [self layoutImageView];
-  if (@available(iOS 13.0, *)) {
+  if (@available(iOS 13.5, *)) {
     [self layoutTOSTextView];
   } else {
     [self layoutLegacyTOSLabel];
@@ -472,7 +472,7 @@ const char kTermsOfServiceUrl[] = "internal://terms-of-service";
       kOptInLabelPadding[[self heightSizeClassIdiom]];
   CGFloat optInLabelOriginX =
       base::i18n::IsRTL() ? 0.0f : optInLabelSidePadding;
-  if (@available(iOS 13.0, *)) {
+  if (@available(iOS 13.5, *)) {
     self.optInLabel.frame = AlignRectOriginAndSizeToPixels(
         CGRectMake(optInLabelOriginX,
                    CGRectGetMaxY(self.TOSTextView.frame) + optInLabelTopPadding,
@@ -554,7 +554,7 @@ const char kTermsOfServiceUrl[] = "internal://terms-of-service";
   [self configureContainerView];
   [self configureTitleLabel];
   [self configureImageView];
-  if (@available(iOS 13.0, *)) {
+  if (@available(iOS 13.5, *)) {
     [self configureTOSTextView];
   } else {
     [self configureLegacyTOSLabel];