[ObjC ARC] Converts ios/chrome/browser:browser_impl to ARC.Automatically generated ARCMigrate com…

ios/chrome/browser/ios_chrome_main_parts.mm

Index: ios/chrome/browser/ios_chrome_main_parts.mm
diff --git a/ios/chrome/browser/ios_chrome_main_parts.mm b/ios/chrome/browser/ios_chrome_main_parts.mm
index d80cd693e64aeda170aad56704d3c5d47f434f6d..edc937382e9ef6c1553986f78649aca7a761fd3f 100644
--- a/ios/chrome/browser/ios_chrome_main_parts.mm
+++ b/ios/chrome/browser/ios_chrome_main_parts.mm
@@ -59,6 +59,10 @@
 #include "ios/chrome/browser/rlz/rlz_tracker_delegate_impl.h"  // nogncheck
 #endif
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 IOSChromeMainParts::IOSChromeMainParts(
     const base::CommandLine& parsed_command_line)
     : parsed_command_line_(parsed_command_line), local_state_(nullptr) {