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

chrome/browser/cocoa/bookmark_bar_bridge_unittest.mm

Index: chrome/browser/cocoa/bookmark_bar_bridge_unittest.mm
===================================================================
--- chrome/browser/cocoa/bookmark_bar_bridge_unittest.mm	(revision 24882)
+++ chrome/browser/cocoa/bookmark_bar_bridge_unittest.mm	(working copy)
@@ -7,6 +7,7 @@
 #include "chrome/browser/cocoa/browser_test_helper.h"
 #include "chrome/browser/cocoa/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
 
 // TODO(jrg): add OCMock to Chromium to save some typing.
 
@@ -90,7 +91,7 @@
 @end
 
 
-class BookmarkBarBridgeTest : public testing::Test {
+class BookmarkBarBridgeTest : public PlatformTest {
  public:
   CocoaTestHelper cocoa_helper_;
   BrowserTestHelper browser_test_helper_;