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

chrome/browser/cocoa/download_shelf_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.
 
 #include "chrome/browser/cocoa/browser_test_helper.h"
 #include "chrome/browser/cocoa/cocoa_test_helper.h"
 #include "chrome/browser/cocoa/download_shelf_mac.h"
 #include "testing/gtest/include/gtest/gtest.h"
-
+#include "testing/platform_test.h"
 
 // A fake implementation of DownloadShelfController. It implements only the
 // methods that DownloadShelfMac call during the tests in this file. We get this
 // class into the DownloadShelfMac constructor by some questionable casting --
 // Objective C is a dynamic language, so we pretend that's ok.
 
 @interface FakeDownloadShelfController : NSObject {
  @public
   int callCountIsVisible;
   int callCountShow;
@@ skipping 18 matching lines @@
 
 - (IBAction)hide:(id)sender {
   ++callCountHide;
 }
 
 @end
 
 
 namespace {
 
-class DownloadShelfMacTest : public testing::Test {
+class DownloadShelfMacTest : public PlatformTest {
 
   virtual void SetUp() {
     shelf_controller_.reset([[FakeDownloadShelfController alloc] init]);
   }
 
  protected:
   scoped_nsobject<FakeDownloadShelfController> shelf_controller_;
   CocoaTestHelper helper_;
   BrowserTestHelper browser_helper_;
 };
@@ skipping 23 matching lines @@
 
 TEST_F(DownloadShelfMacTest, ForwardsIsShowing) {
   DownloadShelfMac shelf(browser_helper_.browser(),
       (DownloadShelfController*)shelf_controller_.get());
   EXPECT_EQ(0, shelf_controller_.get()->callCountIsVisible);
   shelf.IsShowing();
   EXPECT_EQ(1, shelf_controller_.get()->callCountIsVisible);
 }
 
 }  // namespace