Remove crash signature that has not occurred in the last several hundred runs.

chrome/test/data/reliability/known_crashes.txt

 # This file contains known patterns of crash signatures. One pattern per line.
 #
 # A crash signature is the concatenation of the top N functions, delimited by
 # '___', in chrome.dll on the crash stack. All characters are lower case.
 #
 # We use crash signature patterns as our list of known crashes. A crash
 # signature pattern is a string that can be used to identify a known crash. We
 # use the notion of patterns because crashes with the same root cause can often
 # differ somewhat in their crash stacks. A pattern is intended to be a
 # generalized, yet still identifying, form of a particular crash. Usually a
@@ skipping 125 matching lines @@
 
 # 72832
 PREFIX : webcore::renderblock::marginbeforeforchild___webcore::renderblock::addoverflowfromfloats___webcore::renderblock::computeoverflow___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutpositionedobjects___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::frameview::layout___webcore::document::updatelayout___webcore::document::updatelayoutignorependingstylesheets___webcore::element::offsetwidth___webcore::elementinternal::offsetwidthattrgetter
 
 # 73575
 PREFIX: webkit::webnode::document___autofill::formmanager::resetframe___renderview::willclose___webkit::frameloaderclientimpl::dispatchwillclose___webcore::frameloader::closeolddatasources___webcore::frameloader::commitprovisionalload___webcore::documentloader::commitload___webcore::documentloader::receiveddata___webcore::mainresourceloader::adddata___webcore::resourceloader::didreceivedata___webcore::mainresourceloader::didreceivedata___webcore::resourceloader::didreceivedata___webcore::resourcehandleinternal::didreceivedata___webkit_glue::weburlloaderimpl::context::onreceiveddata___resourcedispatcher::onreceiveddata___ipc::messagewithtuple<tuple3<int,void *,int> >::dispatch<resourcedispatcher,resourcedispatcher,int,void *,int>___resourcedispatcher::dispatchmessagew___resourcedispatcher::onmessagereceived___childthread::onmessagereceived___runnablemethod<spellcheckhost,void (__thiscall spellcheckhost::*)(std::basic_string<char,std::char_traits<char>,std::allocator<char> > const &),tuple1<std::basic_string<char,std::char_traits<char>,std::allocator<char> > > >::run___messageloop::runtask___messageloop::dowork___base::messagepumpdefault::run___messageloop::runinternal___messageloop::run___renderermain___`anonymous namespace'::runnamedprocesstypemain___chromemain___maindllloader::launch___wwinmain_____tmaincrtstartup
 
 # 74607
 PREFIX: webcore::renderstyle::getshadowverticalextent___webcore::inlineflowbox::addtextboxvisualoverflow___webcore::inlineflowbox::computeoverflow___webcore::renderblock::layoutinlinechildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutpositionedobjects___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::rendertablecell::layout___webcore::rendertablerow::layout___webcore::rendertablesection::layout___webcore::rendertable::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderblock::layoutblockchild___webcore::renderblock::layoutblockchildren___webcore::renderblock::layoutblock___webcore::renderblock::layout___webcore::renderview::layout___webcore::frameview::layout___webcore::frameview::updatelayoutandstyleifneededrecursive___renderwidget::dodeferredupdate___renderwidget::onupdaterectack___ipc::message::dispatch<renderview,renderview>___renderwidget::onmessagereceived___renderview::onmessagereceived___messagerouter::routemessage___messagerouter::onmessagereceived___childthread::onmessagereceived___runnablemethod<cancelablerequest<callbackrunner<tuple3<int,scoped_refptr<history::mostvisitedthumbnails>,bool> > >,void (__thiscall cancelablerequest<callbackrunner<tuple3<int,scoped_refptr<history::mostvisitedthumbnails>,bool> > >::*)(tuple3<int,scoped_refptr<history::mostvisitedthumbnails>,bool> const &),tuple1<tuple3<int,scoped_refptr<history::mostvisitedthumbnails>,bool> > >::run___messageloop::runtask___messageloop::dowork___base::messagepumpdefault::run___messageloop::runinternal___messageloop::run___renderermain___`anonymous namespace'::runnamedprocesstypemain___chromemain___maindllloader::launch___wwinmain_____tmaincrtstartup
 
-# 74926
-PREFIX: webcore::htmltreebuilder::constructtreefromatomictoken___webcore::htmltreebuilder::constructtreefromtoken___webcore::htmldocumentparser::pumptokenizer___webcore::htmldocumentparser::insert___webcore::htmldocumentparser::parsedocumentfragment___webcore::documentfragment::parsehtml___webcore::createfragmentfromsource___webcore::htmlelement::setinnerhtml___webcore::htmlelementinternal::innerhtmlattrsetter___v8::internal::jsobject::setpropertywithcallback___v8::internal::jsobject::setproperty___v8::internal::jsobject::setproperty___v8::internal::storeic::store___v8::internal::storeic_miss
-
 # 75352
 PREFIX: webcore::reportfatalerrorinv8___v8::internal::v8::fatalprocessoutofmemory___v8::internal::setelement___v8::internal::runtime::setobjectproperty___v8::internal::runtime_setproperty___v8::internal::invoke___v8::internal::execution::call___v8::script::run___webcore::v8proxy::runscript___webcore::v8proxy::evaluate___webcore::scriptcontroller::evaluate___webcore::scriptelement::executescript___webcore::scriptelement::preparescript___webcore::htmlscriptrunner::runscript___webcore::htmlscriptrunner::execute___webcore::htmldocumentparser::runscriptsforpausedtreebuilder___webcore::htmldocumentparser::cantakenexttoken___webcore::htmldocumentparser::pumptokenizer___webcore::htmldocumentparser::resumeparsingafterscriptexecution___webcore::htmldocumentparser::notifyfinished___webcore::cachedscript::checknotify___webcore::cachedscript::data___webcore::cachedresourcerequest::didfinishloading___webcore::subresourceloader::didfinishloading___webcore::resourceloader::didfinishloading___webcore::resourcehandleinternal::didfinishloading___webkit_glue::weburlloaderimpl::context::oncompletedrequest___resourcedispatcher::onrequestcomplete___ipc::messagewithtuple<tuple4<int,net::urlrequeststatus,std::basic_string<char,std::char_traits<char>,std::allocator<char> >,base::time> >::dispatch<resourcedispatcher,resourcedispatcher,void (__thiscall resourcedispatcher::*)(int,net::urlrequeststatus const &,std::basic_string<char,std::char_traits<char>,std::allocator<char> > const &,base::time const &)>___resourcedispatcher::dispatchmessagew___resourcedispatcher::onmessagereceived___childthread::onmessagereceived___runnablemethod<cancelablerequest<callbackrunner<tuple2<int,std::vector<history::mostvisitedurl,std::allocator<history::mostvisitedurl> > > > >,void (__thiscall cancelablerequest<callbackrunner<tuple2<int,std::vector<history::mostvisitedurl,std::allocator<history::mostvisitedurl> > > > >::*)(tuple2<int,std::vector<history::mostvisitedurl,std::allocator<history::mostvisitedurl> > > const &),tuple1<tuple2<int,std::vector<history::mostvisitedurl,std::allocator<history::mostvisitedurl> > > > >::run___messageloop::runtask___messageloop::dowork___base::messagepumpdefault::run___messageloop::runinternal___messageloop::run___renderermain___`anonymous namespace'::runnamedprocesstypemain___chromemain___maindllloader::launch___wwinmain_____tmaincrtstartup
 
 # 75368
 PREFIX: skpixelref::unlockpixels___skbitmap::freepixels___webcore::framedata::clear___wtf::vector<webcore::framedata,0>::shrink___webcore::bitmapimage::~bitmapimage___webcore::bitmapimage::`scalar deleting destructor'___webcore::cachedimage::~cachedimage___webcore::cachedimage::`scalar deleting destructor'
 
 # 75459
 PREFIX: webcore::inlinebox::logicalheight___webcore::inlineflowbox::maxyvisualoverflow___webcore::renderlineboxlist::anylineintersectsrect___webcore::renderlineboxlist::paint___webcore::renderblock::paintcontents___webcore::renderblock::paintobject
 
 # 75490
@@ skipping 12 matching lines @@
 PREFIX: webcore::renderlineboxlist::deletelineboxes___webcore::renderblock::layoutinlinechildren___webcore::renderblock::layoutblock
 
 # 76955
 PREFIX: webcore::renderobject::destroy___webcore::renderobjectchildlist::destroyleftoverchildren___webcore::renderblock::destroy
 
 # 77176
 PREFIX: webcore::implicitanimation::~implicitanimation___webcore::implicitanimation::`scalar deleting destructor'___wtf::hashtable<wtf::refptr<webcore::animationbase>,wtf::refptr<webcore::animationbase>,wtf::identityextractor<wtf::refptr<webcore::animationbase> >,wtf::ptrhash<wtf::refptr<webcore::animationbase> >,wtf::hashtraits<wtf::refptr<webcore::animationbase> >,wtf::hashtraits<wtf::refptr<webcore::animationbase> > >::deallocatetable
 
 # 21054
 REGEX : ^deletetask.*::run___messageloop::runtask___messageloop::dowork