Possible bot crash

$  /b/build/slave/Mac10_6_Tests__1_/build/src/out/Release/browser_tests --gtest_filter=PlatformAppBrowserTest.Restrictions  --single-process

Thread 0 Crashed:  CrBrowserMain  Dispatch queue: com.apple.main-thread
0   ???                                 0x06ec21dd 0 + 116138461
1   browser_tests                       0x1fb193a1 content::RenderFrameHostImpl::~RenderFrameHostImpl() + 17
2   browser_tests                       0x1fb1c82d content::RenderFrameHostManager::~RenderFrameHostManager() + 77
3   browser_tests                       0x1fb0ba27 content::FrameTreeNode::~FrameTreeNode() + 151
4   browser_tests                       0x1fb09e26 content::FrameTree::~FrameTree() + 38
5   browser_tests                       0x1fccf86c content::WebContentsImpl::~WebContentsImpl() + 2060
6   browser_tests                       0x1fccfd71 content::WebContentsImpl::~WebContentsImpl() + 17
7   browser_tests                       0x202c6437 extensions::ExtensionHost::~ExtensionHost() + 439
8   browser_tests                       0x202c6561 extensions::ExtensionHost::~ExtensionHost() + 17
9   browser_tests                       0x202e56d8 extensions::ProcessManager::Observe(int, content::NotificationSource const&, content::NotificationDetails const&) + 824
10  browser_tests                       0x1fbd1419 content::NotificationServiceImpl::Notify(int, content::NotificationSource const&, content::NotificationDetails const&) + 4649
11  browser_tests                       0x1ce29a93 Profile::MaybeSendDestroyedNotification() + 67
12  browser_tests                       0x1ce29ad8 ProfileDestroyer::DestroyProfileWhenAppropriate(Profile*) + 56
13  browser_tests                       0x1ce46f12 linked_ptr<ProfileManager::ProfileInfo>::~linked_ptr() + 66
14  browser_tests                       0x1ce47af3 std::_Rb_tree<base::FilePath, std::pair<base::FilePath const, linked_ptr<ProfileManager::ProfileInfo> >, std::_Select1st<std::pair<base::FilePath const, linked_ptr<ProfileManager::ProfileInfo> > >, std::less<base::FilePath>, std::allocator<std::pair<base::FilePath const, linked_ptr<ProfileManager::ProfileInfo> > > >::_M_erase(std::_Rb_tree_node<std::pair<base::FilePath const, linked_ptr<ProfileManager::ProfileInfo> > >*) + 51
15  browser_tests                       0x1ce41c43 ProfileManager::~ProfileManager() + 115
16  browser_tests                       0x1ce41ce1 ProfileManager::~ProfileManager() + 17
17  browser_tests                       0x1cb51ace BrowserProcessImpl::StartTearDown() + 478
18  browser_tests                       0x1cb8c6d9 ChromeBrowserMainParts::PostMainMessageLoopRun() + 233
19  browser_tests                       0x1fa86f91 content::BrowserMainLoop::ShutdownThreadsAndCleanUp() + 289
20  browser_tests                       0x1fa88fe3 content::BrowserMainRunnerImpl::Shutdown() + 163
21  browser_tests                       0x1fa82dd8 content::BrowserMain(content::MainFunctionParams const&) + 200
22  browser_tests                       0x20940a83 content::RunNamedProcessTypeMain(std::string const&, content::MainFunctionParams const&, content::ContentMainDelegate*) + 179
23  browser_tests                       0x2094156e content::ContentMainRunnerImpl::Run() + 126
24  browser_tests                       0x209407d2 content::ContentMain(content::ContentMainParams const&) + 50
25  browser_tests                       0x209420a7 content::BrowserTestBase::SetUp() + 887
26  browser_tests                       0x1d20c0d2 InProcessBrowserTest::SetUp() + 146
27  browser_tests                       0x1c493687 virtual thunk to ExtensionBrowserTest::SetUp() + 87
28  browser_tests                       0x1d59f994 testing::Test::Run() + 212
29  browser_tests                       0x1d5a06c1 testing::TestInfo::Run() + 625
30  browser_tests                       0x1d5a0abb testing::TestCase::Run() + 347
31  browser_tests                       0x1d5a65db testing::internal::UnitTestImpl::RunAllTests() + 1323
32  browser_tests                       0x1d5a6097 testing::UnitTest::Run() + 103
33  browser_tests                       0x1d2bf686 base::TestSuite::Run() + 182
34  browser_tests                       0x1ca51449 ChromeBrowserTestSuiteRunner::RunTestSuite(int, char**) + 41
35  browser_tests                       0x1d20b1e2 (anonymous namespace)::ChromeTestLauncherDelegate::RunTestSuite(int, char**) + 34
36  browser_tests                       0x2098303c content::LaunchTests(content::TestLauncherDelegate*, int, int, char**) + 716
37  browser_tests                       0x1d20b193 LaunchChromeTests(int, ChromeTestSuiteRunner*, int, char**) + 67
38  browser_tests                       0x1ca5140d main + 77
39  browser_tests                       0x1c059835 start + 53