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

ios/web/web_state/js/crw_js_post_request_loader_unittest.mm

 // Copyright 2015 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 "ios/web/web_state/js/crw_js_post_request_loader.h"
 
 #import <WebKit/WebKit.h>
 
 #import "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #import "base/test/ios/wait_util.h"
 #include "ios/web/public/test/web_test.h"
 #import "ios/web/public/web_view_creation_util.h"
 #import "ios/web/web_state/ui/crw_wk_script_message_router.h"
 #import "testing/gtest_mac.h"
 #import "third_party/ocmock/OCMock/OCMock.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace base {
 namespace {
 
 typedef web::WebTest CRWJSPOSTRequestLoaderTest;
 
 // This script takes a JavaScript blob and converts it to a base64-encoded
 // string asynchronously, then is sent to XHRSendHandler message handler.
 NSString* const kBlobToBase64StringScript =
     @"var blobToBase64 = function(x) {"
      "  var reader = new window.FileReader();"
      "  reader.readAsDataURL(x);"
      "  reader.onloadend = function() {"
      "    base64data = reader.result;"
      "    window.webkit.messageHandlers.XHRSendHandler.postMessage(base64data);"
      "  };"
      "};";
 
 // Tests that the POST request is correctly executed through XMLHttpRequest.
 // TODO(crbug.com/592034): This test is flaky on device.
 #if TARGET_IPHONE_SIMULATOR
 #define MAYBE_LoadsCorrectHTML LoadsCorrectHTML
 #else
 #define MAYBE_LoadsCorrectHTML DISABLED_LoadsCorrectHTML
 #endif
+
 TEST_F(CRWJSPOSTRequestLoaderTest, MAYBE_LoadsCorrectHTML) {
   // Set up necessary objects.
-  scoped_nsobject<CRWJSPOSTRequestLoader> loader(
-      [[CRWJSPOSTRequestLoader alloc] init]);
+  CRWJSPOSTRequestLoader* loader = [[CRWJSPOSTRequestLoader alloc] init];
   WKWebView* web_view = web::BuildWKWebView(CGRectZero, GetBrowserState());
   WKUserContentController* contentController =
       web_view.configuration.userContentController;
-  scoped_nsobject<CRWWKScriptMessageRouter> messageRouter(
-      [[CRWWKScriptMessageRouter alloc]
-          initWithUserContentController:contentController]);
+  CRWWKScriptMessageRouter* messageRouter = [[CRWWKScriptMessageRouter alloc]
+      initWithUserContentController:contentController];
 
   // Override XMLHttpRequest.send() to call kBlobToBase64StringScript.
   __block BOOL overrideSuccessfull = NO;
   NSString* JS = [kBlobToBase64StringScript stringByAppendingString:@";\
       XMLHttpRequest.prototype.send = function(x) { blobToBase64(x); };"];
   [web_view evaluateJavaScript:JS
              completionHandler:^(id, NSError*) {
                overrideSuccessfull = YES;
              }];
   base::test::ios::WaitUntilCondition(^bool {
@@ skipping 35 matching lines @@
     return complete;
   });
 
   // Clean up installed script handler.
   [messageRouter removeScriptMessageHandlerForName:@"XHRSendHandler"
                                            webView:web_view];
 }
 
 }  // namespace
 }  // namespace base