[ObjC ARC] Converts ios/chrome/browser/ui/autofill:autofill to ARC.

ios/chrome/browser/ui/autofill/storage_switch_tooltip.mm

Index: ios/chrome/browser/ui/autofill/storage_switch_tooltip.mm
diff --git a/ios/chrome/browser/ui/autofill/storage_switch_tooltip.mm b/ios/chrome/browser/ui/autofill/storage_switch_tooltip.mm
index ea6e9a297e9cf7b0a2c1640af9b4b8f8ad505826..fc266c76a409f8061553e6514af9d86bd48d3a0b 100644
--- a/ios/chrome/browser/ui/autofill/storage_switch_tooltip.mm
+++ b/ios/chrome/browser/ui/autofill/storage_switch_tooltip.mm
@@ -9,6 +9,10 @@
 #import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 const CGFloat kCornerRadius = 2.0f;