Adding stack trace to known crashes list.

chrome/test/data/reliability/known_crashes.txt

Index: chrome/test/data/reliability/known_crashes.txt
diff --git a/chrome/test/data/reliability/known_crashes.txt b/chrome/test/data/reliability/known_crashes.txt
index ccaf3ec7a09b12cba052964d5078ba9478f774e2..ac1529c1d00aa19f19b5516983c6a407ea74d0f1 100644
--- a/chrome/test/data/reliability/known_crashes.txt
+++ b/chrome/test/data/reliability/known_crashes.txt
@@ -192,3 +192,7 @@ webcore::position::getinlineboxandoffset___webcore::position::getinlineboxandoff
 # 47839
 PREFIX:
 base::objectwatcher::stopwatching___lockimpl::unlock___`anonymous namespace'::rolloverprotectednow___lockimpl::lock___conditionvariable::signal___watchdog::armsometimedeltaago___`anonymous namespace'::jankobserverhelper::startprocessingtimers___base::messagepumpforio::waitforiocompletion___base::messagepumpforio::dorunloop___base::messagepumpwin::run___messageloop::runinternal___messageloop::run___base::thread::run___base::thread::threadmain___`anonymous namespace'::threadfunc
+
+# 47846
+PREFIX:
+webcore::scriptcontroller::canexecutescripts___webcore::v8proxy::mainworldcontext___webcore::tov8context