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

ios/chrome/browser/ui/network_activity_indicator_manager_unittest.mm

 // Copyright 2016 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/chrome/browser/ui/network_activity_indicator_manager.h"
 
 #import <UIKit/UIKit.h>
 
-#include "base/mac/scoped_nsobject.h"
 #include "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 NSString* const kNetworkActivityKeyOne =
     @"NetworkActivityIndicatorManagerTest.NetworkActivityIndicatorKeyOne";
 NSString* const kNetworkActivityKeyTwo =
     @"NetworkActivityIndicatorManagerTest.NetworkActivityIndicatorKeyTwo";
 
 class NetworkActivityIndicatorManagerTest : public PlatformTest {
  public:
   NetworkActivityIndicatorManagerTest()
       : manager_([[NetworkActivityIndicatorManager alloc] init]) {}
 
  protected:
   void ExpectNetworkActivity(NSUInteger groupOneCount,
                              NSUInteger groupTwoCount) {
     EXPECT_EQ([manager_ numNetworkTasksForGroup:kNetworkActivityKeyOne],
               groupOneCount);
     EXPECT_EQ([manager_ numNetworkTasksForGroup:kNetworkActivityKeyTwo],
               groupTwoCount);
     EXPECT_EQ([manager_ numTotalNetworkTasks], groupOneCount + groupTwoCount);
     if (groupOneCount + groupTwoCount > 0U) {
       EXPECT_TRUE([[UIApplication sharedApplication]
           isNetworkActivityIndicatorVisible]);
     } else {
       EXPECT_FALSE([[UIApplication sharedApplication]
           isNetworkActivityIndicatorVisible]);
     }
   }
-  base::scoped_nsobject<NetworkActivityIndicatorManager> manager_;
+  NetworkActivityIndicatorManager* manager_;
 };
 
 TEST_F(NetworkActivityIndicatorManagerTest, TestNumNetworkTasksForGroup) {
   EXPECT_EQ([manager_ numNetworkTasksForGroup:kNetworkActivityKeyOne], 0U);
   EXPECT_EQ([manager_ numNetworkTasksForGroup:kNetworkActivityKeyTwo], 0U);
   [manager_ startNetworkTasks:2U forGroup:kNetworkActivityKeyOne];
   EXPECT_EQ([manager_ numNetworkTasksForGroup:kNetworkActivityKeyOne], 2U);
   EXPECT_EQ([manager_ numNetworkTasksForGroup:kNetworkActivityKeyTwo], 0U);
   [manager_ startNetworkTasks:3U forGroup:kNetworkActivityKeyTwo];
   EXPECT_EQ([manager_ numNetworkTasksForGroup:kNetworkActivityKeyOne], 2U);
@@ skipping 86 matching lines @@
   ExpectNetworkActivity(5U, 4U);
   [manager_ stopNetworkTasks:2U forGroup:kNetworkActivityKeyTwo];
   ExpectNetworkActivity(5U, 2U);
   [manager_ stopNetworkTasks:5U forGroup:kNetworkActivityKeyOne];
   ExpectNetworkActivity(0U, 2U);
   [manager_ clearNetworkTasksForGroup:kNetworkActivityKeyTwo];
   ExpectNetworkActivity(0U, 0U);
 }
 
 }  // namespace