[ObjC ARC] Converts ios/chrome/browser/ui/contextual_search:unit_tests to ARC.

ios/chrome/browser/ui/contextual_search/contextual_search_js_unittest.mm

 // Copyright 2014 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 <memory>
 
 #include "base/ios/ios_util.h"
 #include "base/json/json_reader.h"
-#include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #import "base/test/ios/wait_util.h"
 #include "base/values.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #import "ios/chrome/browser/ui/contextual_search/contextual_search_controller.h"
 #import "ios/chrome/browser/ui/contextual_search/js_contextual_search_manager.h"
 #import "ios/chrome/browser/ui/contextual_search/touch_to_search_permissions_mediator+testing.h"
 #import "ios/chrome/browser/web/chrome_web_test.h"
 #import "ios/web/public/web_state/js/crw_js_injection_manager.h"
 #import "ios/web/public/web_state/js/crw_js_injection_receiver.h"
 #import "ios/web/public/web_state/web_state.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "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
+
 // Unit tests for the resources/contextualsearch.js JavaScript file.
 
 struct ContextualSearchStruct {
   std::string url;
   std::string selectedText;
   std::string surroundingText;
   int offsetStart;
   int offsetEnd;
 };
 
@@ skipping 176 matching lines @@
       longString = [longString stringByAppendingString:sentence];
       if (newLine) {
         longString = [longString stringByAppendingString:@"<br/>"];
       }
     }
     return longString;
   }
 
   void SetUp() override {
     ChromeWebTest::SetUp();
-    mockDelegate_.reset([[OCMockObject
-        niceMockForProtocol:@protocol(ContextualSearchControllerDelegate)]
-        retain]);
+    mockDelegate_ = [OCMockObject
+        niceMockForProtocol:@protocol(ContextualSearchControllerDelegate)];
     jsUnittestsAdditions_ = static_cast<JsContextualSearchAdditionsManager*>(
         [web_state()->GetJSInjectionReceiver()
             instanceOfClass:[JsContextualSearchAdditionsManager class]]);
     TestChromeBrowserState::Builder test_cbs_builder;
     chrome_browser_state_ = test_cbs_builder.Build();
-    controller_.reset([[ContextualSearchController alloc]
+    controller_ = [[ContextualSearchController alloc]
         initWithBrowserState:chrome_browser_state_.get()
-                    delegate:mockDelegate_]);
+                    delegate:mockDelegate_];
     [controller_
         setPermissions:[[MockTouchToSearchPermissionsMediator alloc]
                            initWithBrowserState:chrome_browser_state_.get()]];
     [controller_ setWebState:web_state()];
     [controller_ enableContextualSearch:YES];
   }
 
   void TearDown() override {
     [controller_ close];
     // Need to tear down the controller so it deregisters its JS handlers
     // before |webController_| is destroyed.
-    controller_.reset();
+    controller_ = nil;
     ChromeWebTest::TearDown();
   }
 
   std::unique_ptr<TestChromeBrowserState> chrome_browser_state_;
   __unsafe_unretained JsContextualSearchAdditionsManager* jsUnittestsAdditions_;
-  base::scoped_nsobject<ContextualSearchController> controller_;
-  base::scoped_nsobject<id> mockDelegate_;
-  base::scoped_nsobject<id> mockToolbarDelegate_;
+  ContextualSearchController* controller_;
+  id mockDelegate_;
+  id mockToolbarDelegate_;
 };
 
 // Test that ignored elements do not trigger CS when tapped.
 TEST_F(ContextualSearchJsTest, TestIgnoreTapsOnElements) {
   LoadHtml(kHTMLSentenceWithLabel);
   ContextualSearchStruct searchContext;
   ASSERT_FALSE(GetContextFromId(@"taphere", &searchContext));
 };
 
 // Test that ingnored element are not included in highlight or surrounding text.
@@ skipping 217 matching lines @@
   NSString* stringHTML = BuildLongTestString(0, 10, 5, true);
   NSString* expectedHTML = BuildLongTestString(0, 10, -1, false);
   // LoadHtml will trim the last space.
   LoadHtml(
       [NSString stringWithFormat:@"<html><body>%@</body></html>", stringHTML]);
   ContextualSearchStruct searchContext;
   ASSERT_TRUE(GetContextFromId(@"taphere", &searchContext));
   CheckContextOffsets(searchContext, base::SysNSStringToUTF8(expectedHTML));
 };
 }  // namespace