Revert 71327 - Attempt at fixing crash in ProcessPendingTabs. With the curren...

chrome/test/data/reliability/known_crashes.txt

Index: chrome/test/data/reliability/known_crashes.txt
===================================================================
--- chrome/test/data/reliability/known_crashes.txt	(revision 71335)
+++ chrome/test/data/reliability/known_crashes.txt	(working copy)
@@ -40,6 +40,9 @@
 # is the only one on the stack, so ignore that instance
 REGEX : `anonymous namespace'::invalidparameter$
 
+# 15620
+PREFIX : browser::processpendingtabs___browser::clearunloadstate
+
 # 47207
 PREFIX : messageloop::runtask___messageloop::deferorrunpendingtask___messageloop::dodelayedwork___base::messagepumpforio::dorunloop___base::messagepumpwin::run___messageloop::runinternal___messageloop::run___base::thread::run___base::thread::threadmain___`anonymous namespace'::threadfunc
 PREFIX : messageloop::runtask___messageloop::dodelayedwork___base::messagepumpforio::dorunloop___base::messagepumpwin::run___messageloop::runinternal___messageloop::run___base::thread::run___base::thread::threadmain___`anonymous namespace'::threadfunc