Make all of our unit tests be PlatformTests to get an autorelease pool....

chrome/browser/cocoa/download_util_mac_unittest.mm

 // Copyright (c) 2009 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.
 //
 // Download utility test for Mac OS X.
 
 #include "base/path_service.h"
 #include "base/sys_string_conversions.h"
 #import "chrome/browser/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/cocoa/download_util_mac.h"
 #include "chrome/common/chrome_paths.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
 
 namespace {
 
-class DownloadUtilTest : public testing::Test {
+class DownloadUtilTest : public PlatformTest {
  public:
   CocoaTestHelper cocoa_helper_;
 };
 
 // Ensure adding files to the pasteboard methods works as expected.
 TEST_F(DownloadUtilTest, AddFileToPasteboardTest) {
   // Create a pasteboard.
   NSPasteboard* pasteboard = [NSPasteboard pasteboardWithUniqueName];
 
   // Get a download test file for addition to the pasteboard.
@@ skipping 12 matching lines @@
 
   // Ensure the path is what we expect.
   NSArray* files = [pasteboard propertyListForType:NSFilenamesPboardType];
   ASSERT_TRUE(files != nil);
   NSString* expectedPath = [files objectAtIndex:0];
   NSString* realPath = base::SysWideToNSString(testPath.ToWStringHack());
   EXPECT_TRUE([expectedPath isEqualToString:realPath]);
 }
 
 }  // namespace