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

chrome/browser/cocoa/gradient_button_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/gradient_button_cell.h"
 #import "chrome/browser/cocoa/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
 
 @interface GradientButtonCell (HoverValueTesting)
 - (void)adjustHoverValue;
 @end
 
 namespace {
 
-class GradientButtonCellTest : public testing::Test {
+class GradientButtonCellTest : public PlatformTest {
  public:
   GradientButtonCellTest() {
     NSRect frame = NSMakeRect(0, 0, 50, 30);
     view_.reset([[NSButton alloc] initWithFrame:frame]);
     scoped_nsobject<GradientButtonCell> cell([[GradientButtonCell alloc]
                                               initTextCell:@"Testing"]);
     [view_ setCell:cell.get()];
     [cocoa_helper_.contentView() addSubview:view_.get()];
   }
 
@@ skipping 47 matching lines @@
   [cell setShowsBorderOnlyWhileMouseInside:NO];
   EXPECT_FALSE([cell isMouseInside]);
 
   [cell setShowsBorderOnlyWhileMouseInside:YES];
   [cell setShowsBorderOnlyWhileMouseInside:YES];
   [cell setShowsBorderOnlyWhileMouseInside:NO];
   [cell setShowsBorderOnlyWhileMouseInside:NO];
 }
 
 }  // namespace