[ObjC ARC] Converts ios/web:ios_web_public_unittests to ARC.

ios/web/public/origin_util_unittest.mm

Index: ios/web/public/origin_util_unittest.mm
diff --git a/ios/web/public/origin_util_unittest.mm b/ios/web/public/origin_util_unittest.mm
index 79cae2b04e782e378ef6ad8e9d61793c75f23b3a..ec49ff11b30f362520f25ee17c409bdf5077ce36 100644
--- a/ios/web/public/origin_util_unittest.mm
+++ b/ios/web/public/origin_util_unittest.mm
@@ -6,11 +6,13 @@
 
 #import <WebKit/WebKit.h>
 
-#import "base/mac/objc_property_releaser.h"
-#import "base/mac/scoped_nsobject.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // WKSecurityOrigin can not be manually created, hence stub is needed.
 @interface WKSecurityOriginStub : NSObject
 // Methods from WKSecurityOrigin class.
@@ -19,18 +21,10 @@
 @property(nonatomic) NSInteger port;
 @end
 
-@implementation WKSecurityOriginStub {
-  base::mac::ObjCPropertyReleaser _propertyReleaser;
-}
+@implementation WKSecurityOriginStub
 @synthesize protocol = _protocol;
 @synthesize host = _host;
 @synthesize port = _port;
-- (instancetype)init {
-  if (self = [super init]) {
-    _propertyReleaser.Init(self, [WKSecurityOriginStub class]);
-  }
-  return self;
-}
 @end
 
 namespace web {
@@ -45,14 +39,13 @@ TEST(OriginUtilTest, GURLOriginWithNilWKSecurityOrigin) {
 
 // Tests calling GURLOriginWithWKSecurityOrigin with valid origin.
 TEST(OriginUtilTest, GURLOriginWithValidWKSecurityOrigin) {
-  base::scoped_nsobject<WKSecurityOriginStub> origin(
-      [[WKSecurityOriginStub alloc] init]);
+  WKSecurityOriginStub* origin = [[WKSecurityOriginStub alloc] init];
   [origin setProtocol:@"http"];
   [origin setHost:@"chromium.org"];
   [origin setPort:80];
 
-  GURL url(GURLOriginWithWKSecurityOrigin(
-      static_cast<WKSecurityOrigin*>(origin.get())));
+  GURL url(
+      GURLOriginWithWKSecurityOrigin(static_cast<WKSecurityOrigin*>(origin)));
   EXPECT_EQ("http://chromium.org/", url.spec());
   EXPECT_TRUE(url.port().empty());
 }