[ObjC ARC] Converts ios/chrome/browser/find_in_page:unit_tests_nonarc to ARC.

ios/chrome/browser/find_in_page/find_in_page_js_unittest.mm

 // Copyright 2012 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 <UIKit/UIKit.h>
 
 #include "base/mac/foundation_util.h"
-#include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/chrome/browser/find_in_page/find_in_page_model.h"
 #import "ios/chrome/browser/find_in_page/js_findinpage_manager.h"
 #import "ios/chrome/browser/web/chrome_web_test.h"
 #import "ios/web/public/web_state/js/crw_js_injection_receiver.h"
 #import "ios/web/public/web_state/ui/crw_web_view_proxy.h"
 #import "ios/web/public/web_state/web_state.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // Unit tests for the find_in_page.js JavaScript file.
 
 namespace {
 
 // JavaScript invocation to search for 'foo' (for 1000 milliseconds).
 NSString* kJavaScriptToSearchForFoo =
     @"__gCrWeb.findInPage.highlightWord('foo', false, 1000)";
 
 // Other JavaScript functions invoked by the tests.
 NSString* kJavaScriptIncrementIndex = @"__gCrWeb.findInPage.incrementIndex()";
@@ skipping 65 matching lines @@
 
     // Search for 'foo'. Performing the search sets the index to point to the
     // first visible occurence of 'foo'.
     ExecuteJavaScript(kJavaScriptToSearchForFoo);
     AssertJavaScriptValue(kJavaScriptIndex, 1);
     AssertJavaScriptValue(kJavaScriptSpansLength, kNumberOfFoosInHtml);
   }
 
   void SetUp() override {
     ChromeWebTest::SetUp();
-    findInPageModel_.reset([[FindInPageModel alloc] init]);
-    findInPageJsManager_.reset([base::mac::ObjCCastStrict<JsFindinpageManager>(
+    findInPageModel_ = [[FindInPageModel alloc] init];
+    findInPageJsManager_ = base::mac::ObjCCastStrict<JsFindinpageManager>(
         [web_state()->GetJSInjectionReceiver()
-            instanceOfClass:[JsFindinpageManager class]]) retain]);
-    findInPageJsManager_.get().findInPageModel = findInPageModel_;
+            instanceOfClass:[JsFindinpageManager class]]);
+    findInPageJsManager_.findInPageModel = findInPageModel_;
   }
 
-  base::scoped_nsobject<FindInPageModel> findInPageModel_;
-  base::scoped_nsobject<JsFindinpageManager> findInPageJsManager_;
+  FindInPageModel* findInPageModel_;
+  JsFindinpageManager* findInPageJsManager_;
 };
 
 // Performs a search, then calls |incrementIndex| to loop through the
 // matches, ensuring that when the end is reached the index wraps back to zero.
 TEST_F(FindInPageJsTest, IncrementIndex) {
   SearchForFoo();
 
   // Increment index until it hits the max index.
   for (int i = 2; i < kNumberOfFoosInHtml; i++) {
     ExecuteJavaScript(kJavaScriptIncrementIndex);
@@ skipping 94 matching lines @@
   // point to the first visible occurence of the non-Ascii.
   NSString* result = ExecuteJavaScript([NSString
       stringWithFormat:@"__gCrWeb.findInPage.highlightWord('%@', false, 1000)",
                        kNonAscii]);
   DCHECK(result);
   AssertJavaScriptValue(kJavaScriptIndex, 0);
   AssertJavaScriptValue(kJavaScriptSpansLength, 1);
 }
 
 }  // namespace