Retire some beacon+ping flaky test expectations.

LayoutTests/TestExpectations

 
 # This directly has manual tests that don't have to run with run-webkit-tests
 crbug.com/359838 http/tests/ManualTests/ [ Skip ]
 
 crbug.com/258949 fast/filesystem/workers/file-writer-truncate-extend.html [ Failure Pass ]
 
 crbug.com/307782 [ Win ] http/tests/cache/stopped-revalidation.html [ Pass Timeout ]
 crbug.com/316146 [ XP ] http/tests/cache/cached-main-resource.html [ Pass Timeout ]
 
 crbug.com/364267 [ Win Mac ] http/tests/security/webgl-remote-read-remote-image-blocked-no-crossorigin.html [ Pass Timeout ]
@@ skipping 1107 matching lines @@
 crbug.com/408123 fast/multicol/vertical-lr/balancing/balance-trailing-border.html [ Skip ]
 crbug.com/408123 fast/multicol/vertical-lr/balancing/balance-trailing-border-after-break.html [ Skip ]
 crbug.com/408123 fast/multicol/vertical-rl/balancing/balance-short-trailing-empty-block.html [ Skip ]
 crbug.com/408123 fast/multicol/vertical-rl/balancing/balance-trailing-border.html [ Skip ]
 crbug.com/408123 fast/multicol/vertical-rl/balancing/balance-trailing-border-after-break.html [ Skip ]
 crbug.com/350853 fast/multicol/widows.html [ Skip ]
 crbug.com/350853 fast/multicol/widows2.html [ Skip ]
 crbug.com/350853 fast/pagination/auto-height.html [ Skip ]
 crbug.com/350853 fast/pagination/auto-height-with-break.html [ Skip ]
 
-crbug.com/374569 [ Win ] http/tests/navigation/beacon-cross-origin.html [ Pass Failure Timeout ]
 crbug.com/374572 svg/filters/feImage-target-reappend-to-document.svg [ Pass Failure ]
 crbug.com/374572 svg/dynamic-updates/SVGImageElement-svgdom-preserveAspectRatio-prop.html [ Pass ImageOnlyFailure ]
 
 crbug.com/371651 svg/custom/deep-dynamic-updates.svg [ Pass Failure ]
 crbug.com/371651 svg/custom/js-update-gradient.svg [ Pass Failure ]
 crbug.com/371651 svg/custom/js-update-pattern.svg [ Pass Failure ]
 crbug.com/371651 svg/custom/js-update-pattern-child.svg [ Pass Failure ]
 crbug.com/371651 svg/custom/js-update-stop.svg [ Pass Failure ]
 crbug.com/371651 svg/custom/js-update-stop-linked-gradient.svg [ Pass Failure ]
 crbug.com/371651 svg/custom/use-disappears-after-style-update.svg [ Pass Failure ]
@@ skipping 90 matching lines @@
 crbug.com/30536 [ Win ] http/tests/xmlhttprequest/origin-exact-matching/29.html [ Failure ]
 crbug.com/30536 [ Win ] http/tests/xmlhttprequest/origin-exact-matching/30.html [ Failure ]
 crbug.com/30536 [ Win ] http/tests/xmlhttprequest/origin-exact-matching/36.html [ Failure ]
 
 crbug.com/411779 [ Win7 ] http/tests/serviceworker/fetch.html [ Slow ]
 
 # switching to apache-win32 flakiness that needs triaging.
 crbug.com/30536 [ Win ] http/tests/htmlimports/import-cors-credentials.html [ Timeout Pass ]
 crbug.com/30536 [ Win ] http/tests/htmlimports/redirect-cross-origin.html [ Timeout Pass ]
 crbug.com/30536 [ Win7 ] http/tests/navigation/forward-and-cancel.html [ Timeout Pass ]
-crbug.com/30536 [ Win7 ] http/tests/navigation/ping-cookie.html [ Failure Pass ]
-crbug.com/30536 [ Win7 ] http/tests/navigation/ping-same-origin.html [ Failure Pass ]
 crbug.com/30536 [ Win7 ] http/tests/security/contentSecurityPolicy/report-uri-from-child-frame.html [ Failure Pass Timeout ]
 crbug.com/30536 [ Win7 ] http/tests/security/contentSecurityPolicy/report-blocked-file-uri.html [ Timeout Pass ]
 crbug.com/30536 [ Win7 ] http/tests/security/contentSecurityPolicy/report-uri-scheme-relative.html [ Timeout Pass ]
 crbug.com/30536 [ Win ] http/tests/security/frameNavigation/inactive-function-in-popup-navigate-child.html [ Timeout Pass ]
 crbug.com/30536 [ Win Release ] http/tests/security/link-crossorigin-stylesheet-no-cors.html [ Timeout Pass ]
 crbug.com/30536 [ Win ] http/tests/xmlhttprequest/response-json.html [ Timeout Pass ]
 crbug.com/30536 [ Win ] http/tests/xmlhttprequest/origin-exact-matching/00.html [ Timeout Pass ]
 crbug.com/30536 [ Win7 ] http/tests/security/xssAuditor/report-script-tag-full-block.html [ Timeout Pass ]
 crbug.com/30536 [ Win7 ] http/tests/security/xssAuditor/report-script-tag-replace-state.html [ Timeout Pass ]
 crbug.com/30536 [ Win7 ] http/tests/security/xssAuditor/report-script-tag.html [ Timeout Pass ]
@@ skipping 181 matching lines @@
 crbug.com/418091 [ SnowLeopard Debug ] media/track/track-cue-rendering-rtl.html [ Pass Crash ]
 crbug.com/418091 [ Mac ] virtual/antialiasedtext/fast/text/international/bidi-neutral-run.html [ Pass Crash Failure ]
 crbug.com/418091 [ SnowLeopard Debug ] inspector/elements/bidi-dom-tree.html [ Pass Crash ]
 crbug.com/418091 [ SnowLeopard Debug ] virtual/antialiasedtext/fast/text/atsui-bidi-control.html [ Pass Crash ]
 crbug.com/418091 [ SnowLeopard Debug ] fast/text/international/bidi-neutral-run.html [ Pass Crash ]
 crbug.com/418091 [ SnowLeopard Debug ] fast/text/atsui-bidi-control.html [ Pass Crash ]
 crbug.com/418091 [ SnowLeopard ] fast/text/shadow-translucent-fill.html [ Pass Failure ]
 crbug.com/418091 [ SnowLeopard ] fast/text/text-shadow-no-default-color.html [ Pass Failure ]
 
 crbug.com/334269 [ Mac ] virtual/antialiasedtext/fast/text/ipa-tone-letters.html [ Pass Failure ]
-