A bunch of Win tests fail with


[2696:3896:0123/194350.525:380161426:FATAL:iat_patch_function.cc(251)] Check failed: is_patched(). 

https://uberchromegw.corp.google.com/i/internal.client.kitchensync/builders/Mac%20Dev/builds/15560

Sample stack trace:
======
Backtrace:
	base::debug::StackTrace::StackTrace [0x000000000041D46B+107]
	base::debug::StackTrace::StackTrace [0x000000000041C10F+31]
	logging::LogMessage::~LogMessage [0x0000000000494EA6+134]
	base::win::IATPatchFunction::original_function [0x0000000000841A5E+174]
	InitializePDF [0x00000001479BDBCA+138]
	ChromeMainDelegate::PreSandboxStartup [0x00000001467578C1+1073]
	content::ContentMainRunnerImpl::Initialize [0x00000000125167FA+1450]
	content::ContentServiceManagerMainDelegate::Initialize [0x0000000012511BE6+70]
	service_manager::Main [0x0000000016E892FE+718]
	content::ContentMain [0x0000000012515D35+85]
	content::BrowserTestBase::SetUp [0x0000000146379F07+2711]
	InProcessBrowserTest::SetUp [0x0000000142598A03+1363]
	SyncTest::SetUp [0x00000001424EF7E4+820]
	testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,void> [0x000000014019348F+79]
	testing::Test::Run [0x00000001401933B7+103]
	testing::TestInfo::Run [0x0000000140194106+230]
	testing::TestCase::Run [0x0000000140194C63+243]
	testing::internal::UnitTestImpl::RunAllTests [0x000000014019BB77+1063]
	testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool> [0x000000014019B735+85]
	testing::UnitTest::Run [0x000000014019B5B4+308]
	RUN_ALL_TESTS [0x0000000142769531+17]
	base::TestSuite::Run [0x0000000142768AC3+163]
	ChromeTestSuiteRunner::RunTestSuite [0x00000001464B4CBF+127]
	ChromeTestLauncherDelegate::RunTestSuite [0x00000001464B4DAA+58]
	content::LaunchTests [0x0000000146384EFB+811]
	LaunchChromeTests [0x00000001464B548C+428]
	main [0x00000001464B41F1+241]
	invoke_main [0x000000014809A514+52] (f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:79)
	__scrt_common_main_seh [0x000000014809A467+295] (f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283)
	__scrt_common_main [0x000000014809A32E+14] (f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:326)
	mainCRTStartup [0x000000014809A589+9] (f:\dd\vctools\crt\vcstartup\src\startup\exe_main.cpp:17)
	BaseThreadInitThunk [0x0000000076AB5A4D+13]
	RtlUserThreadStart [0x0000000076CEB831+33]
=====

SyncTest has been touched in issue 801569.
However, it seems like the SetUp function was not affected in that CL. 

I've started a new build to see whether this persists.