Move NSAutoreleasePool management into the PlatformTest constructor and...

testing/platform_test_mac.mm

 // 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];
+PlatformTest::PlatformTest()
+    : pool_([[NSAutoreleasePool alloc] init]) {
 }
 
-void PlatformTest::TearDown() {
-  [pool_ drain];
+PlatformTest::~PlatformTest() {
+  [pool_ release];
 }