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

components/autofill/ios/browser/js_suggestion_manager.mm

Index: components/autofill/ios/browser/js_suggestion_manager.mm
diff --git a/components/autofill/ios/browser/js_suggestion_manager.mm b/components/autofill/ios/browser/js_suggestion_manager.mm
index 1d415ce1a49ee38ab063eb009643b809840093de..0818252e56f72731ae7261b05156399e372ac8b8 100644
--- a/components/autofill/ios/browser/js_suggestion_manager.mm
+++ b/components/autofill/ios/browser/js_suggestion_manager.mm
@@ -9,6 +9,10 @@
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // Santizies |str| and wraps it in quotes so it can be injected safely in
 // JavaScript.