Get base_unittests building with the macOS 10.13.0 SDK

base/mac/scoped_objc_class_swizzler_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 "base/mac/scoped_objc_class_swizzler.h"
 
 #import "base/mac/scoped_nsobject.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 @interface ObjCClassSwizzlerTestOne : NSObject
@@ skipping 97 matching lines @@
   {
     base::mac::ScopedObjCClassSwizzler swizzler(
         [ObjCClassSwizzlerTestOne class],
         [ObjCClassSwizzlerTestTwo class],
         @selector(function));
     EXPECT_EQ(20, [ObjCClassSwizzlerTestOne function]);
     EXPECT_EQ(10, [ObjCClassSwizzlerTestTwo function]);
 
     IMP original = swizzler.GetOriginalImplementation();
     id expected_result = reinterpret_cast<id>(10);
-    EXPECT_EQ(expected_result, original(nil, @selector(function)));
+    EXPECT_EQ(expected_result,
+              original([ObjCClassSwizzlerTestOne class], @selector(function)));
   }
 
   EXPECT_EQ(10, [ObjCClassSwizzlerTestOne function]);
   EXPECT_EQ(20, [ObjCClassSwizzlerTestTwo function]);
 }
 
 TEST(ObjCClassSwizzlerTest, SwizzleViaCategory) {
   base::scoped_nsobject<ObjCClassSwizzlerTestOne> object_one(
       [[ObjCClassSwizzlerTestOne alloc] init]);
   EXPECT_EQ(3, [object_one method]);
@@ skipping 28 matching lines @@
     IMP original = swizzler.GetOriginalImplementation();
     id expected_result = reinterpret_cast<id>(3);
     EXPECT_EQ(expected_result, original(child, @selector(method)));
   }
 
   EXPECT_EQ(3, [child method]);
 }
 
 }  // namespace mac
 }  // namespace base