Set up the field trials before IOThread creation. We can't wait until after all the threads are c...

tools/valgrind/tsan/suppressions.txt

 # There are a few kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 756 matching lines @@
   fun:ResourceDispatcherHost::StartReading
   fun:ResourceDispatcherHost::ResumeRequest
   fun:base::internal::RunnableAdapter::Run
 }
 {
   bug_108411
   ThreadSanitizer:Race
   ...
   fun:pa_rtpoll_run
 }
-{
-   bug_109863
-   ThreadSanitizer:Race
-   ...
-   fun:ChromeBrowserMainParts::SetupFieldTrials
-   fun:ChromeBrowserMainParts::SetupMetricsAndFieldTrials
-   fun:ChromeBrowserMainParts::PreMainMessageLoopRunImpl
-   fun:ChromeBrowserMainParts::PreMainMessageLoopRun
-   fun:content::BrowserMainLoop::RunMainMessageLoopParts
-   fun:BrowserMain
-}
-{
-   bug_109864
-   ThreadSanitizer:Race
-   ...
-   fun:net::ClientSocketPoolManagerImpl::ClientSocketPoolManagerImpl
-   fun:net::HttpNetworkSession::HttpNetworkSession
-   fun:IOThread::InitSystemRequestContextOnIOThread
-   fun:base::internal::RunnableAdapter::Run
-}