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

components/autofill/ios/browser/form_suggestion.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/form_suggestion.h"
 
-#include "base/mac/objc_property_releaser.h"
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
 
 @interface FormSuggestion ()
 // Local initializer for a FormSuggestion.
 - (id)initWithValue:(NSString*)value
     displayDescription:(NSString*)displayDescription
                   icon:(NSString*)icon
             identifier:(NSInteger)identifier;
 @end
 
 @implementation FormSuggestion {
   NSString* _value;
   NSString* _displayDescription;

[stkhapugin, 2017/04/11 11:09:16]

I think these ivars are no longer necessary and can be all synthesized.

   NSString* _icon;
   NSInteger _identifier;
-  base::mac::ObjCPropertyReleaser _propertyReleaser_FormSuggestion;
 }
 
 @synthesize value = _value;
 @synthesize displayDescription = _displayDescription;
 @synthesize icon = _icon;
 @synthesize identifier = _identifier;
 
 - (id)initWithValue:(NSString*)value
     displayDescription:(NSString*)displayDescription
                   icon:(NSString*)icon
             identifier:(NSInteger)identifier {
   self = [super init];
   if (self) {
-    _propertyReleaser_FormSuggestion.Init(self, [FormSuggestion class]);
     _value = [value copy];
     _displayDescription = [displayDescription copy];
     _icon = [icon copy];
     _identifier = identifier;
   }
   return self;
 }
 
 + (FormSuggestion*)suggestionWithValue:(NSString*)value
                     displayDescription:(NSString*)displayDescription
                                   icon:(NSString*)icon
                             identifier:(NSInteger)identifier {
-  return [[[FormSuggestion alloc] initWithValue:value
-                             displayDescription:displayDescription
-                                           icon:icon
-                                     identifier:identifier] autorelease];
+  return [[FormSuggestion alloc] initWithValue:value
+                            displayDescription:displayDescription
+                                          icon:icon
+                                    identifier:identifier];
 }
 
 @end