Cleanup: move base/platform_test.h -> testing/

testing/platform_test_mac.mm

Index: testing/platform_test_mac.mm
diff --git a/testing/platform_test_mac.mm b/testing/platform_test_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..e4aaeabb02bda0263cd4b67463adab86f1f6a145
--- /dev/null
+++ b/testing/platform_test_mac.mm
@@ -0,0 +1,15 @@
+// Copyright (c) 2006-2008 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.
+
+#include "platform_test.h"
+
+#import <Foundation/Foundation.h>
+
+void PlatformTest::SetUp() {
+  pool_ = [[NSAutoreleasePool alloc] init];
+}
+
+void PlatformTest::TearDown() {
+  [pool_ drain];
+}