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

chrome/browser/cocoa/tab_cell_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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
 #import "chrome/browser/cocoa/tab_cell.h"
 #import "chrome/browser/cocoa/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
 
 namespace {
 
-class TabCellTest : public testing::Test {
+class TabCellTest : public PlatformTest {
  public:
   TabCellTest() {
     NSRect frame = NSMakeRect(0, 0, 50, 30);
     view_.reset([[NSButton alloc] initWithFrame:frame]);
     scoped_nsobject<TabCell> cell([[TabCell alloc] initTextCell:@"Testing"]);
     [view_ setCell:cell.get()];
     [cocoa_helper_.contentView() addSubview:view_.get()];
   }
 
   CocoaTestHelper cocoa_helper_;  // Inits Cocoa, creates window, etc...
   scoped_nsobject<NSButton> view_;
 };
 
 // Test adding/removing from the view hierarchy, mostly to ensure nothing
 // leaks or crashes.
 TEST_F(TabCellTest, AddRemove) {
   EXPECT_EQ(cocoa_helper_.contentView(), [view_ superview]);
   [view_.get() removeFromSuperview];
   EXPECT_FALSE([view_ superview]);
 }
 
 // Test drawing, mostly to ensure nothing leaks or crashes.
 TEST_F(TabCellTest, Display) {
   [view_ display];
 }
 
 }  // namespace