Makes a couple of tests reset state appropriately

tools/valgrind/drmemory/suppressions.txt

 # This file contains suppressions for the Dr.Memory tool, see
 # http://dev.chromium.org/developers/how-tos/using-drmemory
 #
 # This file contains suppressions for the DrMemory reports happening
 # in the 'light' mode (a.k.a. drmemory_light) as well as in the 'full' mode.
 # Please use suppressions_full.txt for all the reports that can happen only
 # in the full mode (drmemory_full),
 
 ############################
 # Known reports on the third party we have no control over.
@@ skipping 687 matching lines @@
 drmemorylib.dll!replace_operator_delete
 ipc.dll!IPC::Listener::`vector deleting destructor'
 content.dll!content::RenderFrameImpl::~RenderFrameImpl
 content.dll!content::RenderFrameImpl::`vector deleting destructor'
 content.dll!content::RenderViewImpl::~RenderViewImpl
 content.dll!content::RenderViewImpl::`vector deleting destructor'
 content.dll!base::internal::BindState<>::`scalar deleting destructor'
 base.dll!scoped_refptr<>::Release
 base.dll!base::internal::CallbackBase::~CallbackBase
 
-UNADDRESSABLE ACCESS
-name=https://crbug.com/448189
-...
-aura.dll!aura::GetDeviceScaleFactorFromDisplay
-aura.dll!aura::WindowTreeHost::InitCompositor
-aura.dll!aura::WindowTreeHost::InitHost
-ash.dll!ash::DisplayController::AddWindowTreeHostForDisplay
-ash.dll!ash::DisplayController::CreatePrimaryHost
-ash.dll!ash::Shell::Init
-ash.dll!ash::Shell::CreateInstance
-*!ash::test::AshTestHelper::SetUp
-*!ash::test::AshTestBase::SetUp
-
 HANDLE LEAK
 name=http://crbug.com/449989
 system call NtOpenProcess
 KERNELBASE.dll!OpenProcess
 base.dll!base::Process::OpenWithExtraPriviles
 content.dll!content::BrowserMessageFilter::Internal::OnChannelConnected
 ...
 ipc.dll!IPC::ChannelWin::HandleInternalMessage
 ipc.dll!IPC::internal::ChannelReader::DispatchInputData
 ipc.dll!IPC::internal::ChannelReader::AsyncReadComplete
 ipc.dll!IPC::ChannelWin::OnIOCompleted