Add some reliability bot exceptions for WebKit crashiness.

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 aa38acd24e0714c6202949b3b4ce70b897c3ad1f..cf94e1e6341cb0abc01a127b088fd64a7bd6473d 100644
--- a/chrome/test/data/reliability/known_crashes.txt
+++ b/chrome/test/data/reliability/known_crashes.txt
@@ -135,8 +135,13 @@ PREFIX : webkit_glue::resourcefetcher::didfail___webkit_glue::weburlloaderimpl::
 PREFIX : webkit_glue::resourcefetcher::didfail___webkit_glue::weburlloaderimpl::context::oncompletedrequest___resourcedispatcher::onrequestcomplete___ipc::messagewithtuple<tuple4<int,urlrequeststatus,std::basic_string<char,std::char_traits<char>,std::allocator<char> >,base::time> >::dispatch<resourcedispatcher,resourcedispatcher,void (__thiscall resourcedispatcher::*)(int,urlrequeststatus const &,std::basic_string<char,std::char_traits<char>,std::allocator<char> > const &,base::time const &)>___resourcedispatcher::dispatchmessagew___resourcedispatcher::onmessagereceived___childthread::onmessagereceived___runnablemethod<profilewriter,void (__thiscall profilewriter::*)(gurl const &),tuple1<gurl> >::run___messageloop::runtask___messageloop::dowork___base::messagepumpdefault::run___messageloop::runinternal___messageloop::run___renderermain
 
 # 68516
-REGEX: tcmalloc.+webcore.+
-REGEX: `anonymous namespace'::do_free_with_callback.+webcore.+
+REGEX : tcmalloc.+webcore.+
+REGEX : `anonymous namespace'::do_free_with_callback.+webcore.+
+PREFIX : webcore::cssproperty::cssproperty___webcore::cssmutablestyledeclaration::cssmutablestyledeclaration___webcore::cssparser::createstylerule
+PREFIX : webcore::cssstyleselector::applyproperty___webcore::cssstyleselector::applydeclarations
+PREFIX : webcore::cssstylesheet::isloading___webcore::cssstylesheet::checkloaded___webcore::styleelement::createsheet___webcore::styleelement::process___webcore::svgstyleelement::childrenchanged
+PREFIX : webcore::renderlayer::stackingcontext___webcore::renderlayer::addchild___webcore::addlayers___webcore::renderobject::addlayers___webcore::renderobjectchildlist::appendchildnode
+PREFIX : webcore::renderstyle::create___webcore::cssstyleselector::styleforelement
 
 # 70031
 SUBSTRING : webcore::shadowdata::`scalar deleting destructor___webcore::shadowdata::`scalar deleting destructor'___webcore::shadowdata::`scalar deleting destructor'___webcore::shadowdata::`scalar deleting destructor'