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

components/autofill/ios/browser/js_suggestion_manager.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "components/autofill/ios/browser/js_suggestion_manager.h"
 
 #include "base/format_macros.h"
 #include "base/json/string_escape.h"
 #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.
 NSString* JSONEscape(NSString* str) {
   return base::SysUTF8ToNSString(
       base::GetQuotedJSONString(base::SysNSStringToUTF8(str)));
 }
 }  // namespace
 
 @implementation JsSuggestionManager
@@ skipping 73 matching lines @@
     completionHandler(hasPreviousElement, hasNextElement);
   }];
 }
 
 - (void)closeKeyboard {
   [self executeJavaScript:@"document.activeElement.blur()"
         completionHandler:nil];
 }
 
 @end