[ios] Uses ConfirmInfobarDelegate icon on Banner.

Uses the InfobarDelegate Icon to populate the Banner's icon.

Screenshot:
https://drive.google.com/open?id=1ig7tT72B6mFsqHtrAmDO5ANww6HKEGpj

Bug: 961343
Change-Id: If9b8cddfd41b3cef7bc45e7165234f543b3a681d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857048Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705573}

ios/chrome/browser/ui/infobars/coordinators/infobar_confirm_coordinator.mm

@@ -11,6 +11,7 @@
 #import "ios/chrome/browser/ui/infobars/coordinators/infobar_coordinator_implementation.h"
 #import "ios/chrome/browser/ui/infobars/infobar_container.h"
 #import "ios/chrome/browser/ui/infobars/modals/infobar_modal_view_controller.h"
+#include "ui/gfx/image/image.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ -60,6 +61,9 @@
     self.bannerViewController.buttonText =
         base::SysUTF16ToNSString(self.confirmInfobarDelegate->GetButtonLabel(
             ConfirmInfoBarDelegate::BUTTON_OK));
+    gfx::Image modelIcon = self.confirmInfobarDelegate->GetIcon();
+    if (!modelIcon.IsEmpty())
+      self.bannerViewController.iconImage = modelIcon.ToUIImage();
   }
 }