[iOS][Chrome-Guard] Presents Page Info using FormSheet

This CL presents views related to page info using FormSheet.

Bug: 1095644
Change-Id: I58f2f2d343a16912f9effb78ff4ad26a42b569a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249778Reviewed-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@{#779774}

ios/chrome/browser/ui/page_info/page_info_coordinator.mm

@@ -79,6 +79,8 @@
 
   self.navigationController =
       [[TableViewNavigationController alloc] initWithTable:self.viewController];
+  self.navigationController.modalPresentationStyle =
+      UIModalPresentationFormSheet;
 
   self.dispatcher = self.browser->GetCommandDispatcher();
   self.viewController.handler =

ios/chrome/browser/ui/settings/privacy/cookies_coordinator.mm

@@ -56,6 +56,7 @@
     TableViewNavigationController* navigationController =
         [[TableViewNavigationController alloc]
             initWithTable:self.viewController];
+    navigationController.modalPresentationStyle = UIModalPresentationFormSheet;
 
     [self.baseViewController presentViewController:navigationController
                                           animated:YES