[iOS] Adding [super init] in -[UnifiedConsentCoordinator init]

Bug: 827072
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ie88b2fbf10d49b6158d23c37ce593f90c81531b4
Reviewed-on: https://chromium-review.googlesource.com/1069270Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560992}

ios/chrome/browser/ui/authentication/unified_consent/unified_consent_coordinator.mm

@@ -29,6 +29,7 @@
 @synthesize settingsLinkWasTapped = _settingsLinkWasTapped;
 
 - (instancetype)init {
+  self = [super init];
   if (self) {
     _unifiedConsentViewController = [[UnifiedConsentViewController alloc] init];
     _unifiedConsentViewController.delegate = self;