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

components/translate/ios/browser/js_translate_manager_unittest.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/translate/ios/browser/js_translate_manager.h"
 
-#import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/grit/components_resources.h"
 #import "ios/web/public/test/fakes/crw_test_js_injection_receiver.h"
 #import "ios/web/public/test/js_test_util.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 #include "ui/base/resource/resource_bundle.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface JsTranslateManager (Testing)
 - (double)performanceNow;
 @end
 
 @implementation JsTranslateManager (Testing)
 // Returns the time in milliseconds.
 - (double)performanceNow {
   id result = web::ExecuteJavaScript(self.receiver, @"performance.now()");
   return [result doubleValue];
 }
 @end
 
 class JsTranslateManagerTest : public PlatformTest {
  protected:
   JsTranslateManagerTest() {
-    receiver_.reset([[CRWTestJSInjectionReceiver alloc] init]);
-    manager_.reset([[JsTranslateManager alloc] initWithReceiver:receiver_]);
+    receiver_ = [[CRWTestJSInjectionReceiver alloc] init];
+    manager_ = [[JsTranslateManager alloc] initWithReceiver:receiver_];
     base::StringPiece script =
         ResourceBundle::GetSharedInstance().GetRawDataResource(
             IDR_TRANSLATE_JS);
     [manager_ setScript:base::SysUTF8ToNSString(script.as_string() +
                                                 "('DummyKey');")];
   }
 
   bool IsDefined(NSString* name) {
     NSString* script =
         [NSString stringWithFormat:@"typeof %@ != 'undefined'", name];
     return [web::ExecuteJavaScript(receiver_, script) boolValue];
   }
 
-  base::scoped_nsobject<CRWTestJSInjectionReceiver> receiver_;
-  base::scoped_nsobject<JsTranslateManager> manager_;
+  CRWTestJSInjectionReceiver* receiver_;
+  JsTranslateManager* manager_;
 };
 
 // TODO(crbug.com/658619#c47): Test reported as flaky.
 TEST_F(JsTranslateManagerTest, DISABLED_PerformancePlaceholder) {
   [manager_ inject];
   EXPECT_TRUE(IsDefined(@"performance"));
   EXPECT_TRUE(IsDefined(@"performance.now"));
 
   // Check that performance.now returns correct values.
   NSTimeInterval intervalInSeconds = 0.3;
   double startTime = [manager_ performanceNow];
   [NSThread sleepForTimeInterval:intervalInSeconds];
   double endTime = [manager_ performanceNow];
   double timeElapsed = endTime - startTime;
   // The tolerance is high to avoid flake.
   EXPECT_NEAR(timeElapsed, intervalInSeconds * 1000, 100);
 }
 
 TEST_F(JsTranslateManagerTest, Inject) {
   [manager_ inject];
   EXPECT_TRUE([manager_ hasBeenInjected]);
   EXPECT_EQ(nil, [manager_ script]);
   EXPECT_NSEQ(@NO,
               web::ExecuteJavaScript(manager_, @"cr.googleTranslate.libReady"));
 }