Revert of Fix the mechanism by which Blink determines OSX version number.

Source/platform/mac/VersionUtilMacTest.mm

Index: Source/platform/mac/VersionUtilMacTest.mm
diff --git a/Source/platform/mac/VersionUtilMacTest.mm b/Source/platform/mac/VersionUtilMacTest.mm
deleted file mode 100644
index c1af8581bda874890de6947c3534308b86b49206..0000000000000000000000000000000000000000
--- a/Source/platform/mac/VersionUtilMacTest.mm
+++ /dev/null
@@ -1,57 +0,0 @@
-// Copyright 2015 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 "config.h"
-#import "platform/mac/VersionUtilMac.h"
-
-#include <AppKit/AppKit.h>
-#include <gtest/gtest.h>
-
-#ifndef NSAppKitVersionNumber10_7
-#define NSAppKitVersionNumber10_7 1138
-#endif
-
-#ifndef NSAppKitVersionNumber10_9
-#define NSAppKitVersionNumber10_9 1265
-#endif
-
-#ifndef NSAppKitVersionNumber10_10
-#define NSAppKitVersionNumber10_10 1343
-#endif
-
-// This number was determined by writing a tiny Cocoa App on 10.10.4.
-#define NSAppKitVersionNumber10_10Max 1348
-
-// AppKit version is loosely correlated to OSX version. It's still useful as a
-// sanity check in unit tests, though we don't want to rely on it in production
-// code.
-TEST(VersionUtilMac, AppKitVersions)
-{
-    if (floor(NSAppKitVersionNumber) <= NSAppKitVersionNumber10_7) {
-        EXPECT_TRUE(blink::IsOSLionOrEarlier());
-        EXPECT_FALSE(blink::IsOSMavericksOrEarlier());
-        EXPECT_FALSE(blink::IsOSMavericks());
-        return;
-    }
-
-    if (floor(NSAppKitVersionNumber) < NSAppKitVersionNumber10_9) {
-        EXPECT_FALSE(blink::IsOSLionOrEarlier());
-        EXPECT_TRUE(blink::IsOSMavericksOrEarlier());
-        EXPECT_FALSE(blink::IsOSMavericks());
-        return;
-    }
-    if (floor(NSAppKitVersionNumber) == NSAppKitVersionNumber10_9) {
-        EXPECT_FALSE(blink::IsOSLionOrEarlier());
-        EXPECT_TRUE(blink::IsOSMavericksOrEarlier());
-        EXPECT_TRUE(blink::IsOSMavericks());
-        return;
-    }
-    if (floor(NSAppKitVersionNumber) <= NSAppKitVersionNumber10_10Max &&
-        floor(NSAppKitVersionNumber) >=  NSAppKitVersionNumber10_10) {
-        EXPECT_FALSE(blink::IsOSLionOrEarlier());
-        EXPECT_FALSE(blink::IsOSMavericksOrEarlier());
-        EXPECT_FALSE(blink::IsOSMavericks());
-        return;
-    }
-}