Reliability bot: Suppress a crash in FieldTrialList::StatesToString....

chrome/test/data/reliability/known_crashes.txt

Index: chrome/test/data/reliability/known_crashes.txt
===================================================================
--- chrome/test/data/reliability/known_crashes.txt	(revision 52811)
+++ chrome/test/data/reliability/known_crashes.txt	(working copy)
@@ -61,3 +61,5 @@
 # 49384
 PREFIX : anonymous namespace'::cachecreator::docallback___`anonymous namespace'::cachecreator::oniocomplete___disk_cache::inflightbackendio::onoperationcomplete___disk_cache::inflightio::invokecallback___disk_cache::backgroundio::oniosignalled___messageloop::runtask___messageloop::dowork___base::messagepumpforio::dorunloop___base::messagepumpwin::run___messageloop::runinternal___messageloop::run___base::thread::run___base::thread::threadmain___`anonymous namespace'::threadfunc
 
+# 49409
+PREFIX : std::basic_string<char,std::char_traits<char>,std::allocator<char> >::assign___fieldtriallist::statestostring___browserrenderprocesshost::appendrenderercommandline___browserrenderprocesshost::init___renderviewhost::createrenderview___tabcontents::createrenderviewforrendermanager___renderviewhostmanager::initrenderview___renderviewhostmanager::creatependingrenderview___renderviewhostmanager::updaterendererstatefornavigate___renderviewhostmanager::navigate___tabcontents::navigatetopendingentry___navigationcontroller::navigatetopendingentry___navigationcontroller::loadentry___navigationcontroller::loadurl___browser::openurlatindex___browser::openurlfromtab___browser::openurl___automationprovider::navigatetourlblockuntilnavigationscomplete___automationprovider::navigatetourl___ipc