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

ios/chrome/browser/ui/key_commands_provider_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/key_commands_provider.h"
 
-#import "base/mac/scoped_nsobject.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #include "third_party/ocmock/OCMock/OCMock.h"
 #include "third_party/ocmock/gtest_support.h"
 #import "third_party/ocmock/ocmock_extensions.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 typedef PlatformTest KeyCommandsProviderTest;
 
 TEST(KeyCommandsProviderTest, NoTabs_EditingText_ReturnsObjects) {
-  base::scoped_nsobject<KeyCommandsProvider> provider(
-      [[KeyCommandsProvider alloc] init]);
+  KeyCommandsProvider* provider = [[KeyCommandsProvider alloc] init];
   id mockConsumer =
       [OCMockObject mockForProtocol:@protocol(KeyCommandsPlumbing)];
   [[[mockConsumer expect] andReturnUnsignedInteger:0] tabsCount];
 
   EXPECT_NE(nil,
             [provider keyCommandsForConsumer:mockConsumer editingText:YES]);
 }
 
 TEST(KeyCommandsProviderTest, ReturnsKeyCommandsObjects) {
-  base::scoped_nsobject<KeyCommandsProvider> provider(
-      [[KeyCommandsProvider alloc] init]);
+  KeyCommandsProvider* provider = [[KeyCommandsProvider alloc] init];
   id mockConsumer =
       [OCMockObject mockForProtocol:@protocol(KeyCommandsPlumbing)];
   [[[mockConsumer expect] andReturnUnsignedInteger:0] tabsCount];
 
   for (id element in
        [provider keyCommandsForConsumer:mockConsumer editingText:YES]) {
     EXPECT_TRUE([element isKindOfClass:[UIKeyCommand class]]);
   }
 }
 
 TEST(KeyCommandsProviderTest, MoreKeyboardCommandsWhenTabs) {
-  base::scoped_nsobject<KeyCommandsProvider> provider(
-      [[KeyCommandsProvider alloc] init]);
+  KeyCommandsProvider* provider = [[KeyCommandsProvider alloc] init];
   id mockConsumer =
       [OCMockObject mockForProtocol:@protocol(KeyCommandsPlumbing)];
 
   // No tabs.
   [[[mockConsumer expect] andReturnUnsignedInteger:0] tabsCount];
   NSUInteger numberOfKeyCommandsWithoutTabs =
       [[provider keyCommandsForConsumer:mockConsumer editingText:NO] count];
 
   // Tabs.
   [[[mockConsumer expect] andReturnUnsignedInteger:1] tabsCount];
   NSUInteger numberOfKeyCommandsWithTabs =
       [[provider keyCommandsForConsumer:mockConsumer editingText:NO] count];
 
   EXPECT_GT(numberOfKeyCommandsWithTabs, numberOfKeyCommandsWithoutTabs);
 }
 
 TEST(KeyCommandsProviderTest, LessKeyCommandsWhenTabsAndEditingText) {
-  base::scoped_nsobject<KeyCommandsProvider> provider(
-      [[KeyCommandsProvider alloc] init]);
+  KeyCommandsProvider* provider = [[KeyCommandsProvider alloc] init];
   id mockConsumer =
       [OCMockObject mockForProtocol:@protocol(KeyCommandsPlumbing)];
 
   // Not editing text.
   [[[mockConsumer expect] andReturnUnsignedInteger:1] tabsCount];
   NSUInteger numberOfKeyCommandsWhenNotEditingText =
       [[provider keyCommandsForConsumer:mockConsumer editingText:NO] count];
 
   // Editing text.
   [[[mockConsumer expect] andReturnUnsignedInteger:1] tabsCount];
   NSUInteger numberOfKeyCommandsWhenEditingText =
       [[provider keyCommandsForConsumer:mockConsumer editingText:YES] count];
 
   EXPECT_LT(numberOfKeyCommandsWhenEditingText,
             numberOfKeyCommandsWhenNotEditingText);
 }
 
 }  // namespace