PlzNavigate: Eliminate test_runner bailing out of layout tests too early

third_party/WebKit/LayoutTests/FlagExpectations/enable-browser-side-navigation

 # These tests currently fail when run with --enable-browser-side-navigation
 # See https://crbug.com/576261
 # before-unload issues
-  fast/loader/recursive-before-unload-crash.html [ Failure ]
   virtual/pointerevent/fast/events/before-unload-forbidden-navigation.html [ Crash ]
   virtual/pointerevent/fast/events/before-unload-in-subframe.html [ Crash ]
 
 # https://crbug.com/608372: PlzNavigate: support POST navigations
   fast/forms/state-restore-skip-stateless.html [ Crash ]
   fast/forms/submit-to-url-fragment.html [ Failure ]
   fast/forms/xss-auditor-doesnt-crash-on-post-submit.html [ Timeout ]
   fast/loader/form-state-restore-with-frames.html [ Failure ]
   http/tests/history/back-to-post.html [ Timeout ]
   http/tests/navigation/post-goback-same-url.html [ Failure ]
@@ skipping 81 matching lines @@
   http/tests/security/contentSecurityPolicy/1.1/form-action-src-redirect-blocked.html [ Failure ]
   http/tests/security/contentSecurityPolicy/frame-src-redirect-blocked.html [ Timeout ]
   http/tests/security/contentSecurityPolicy/redirect-does-not-match-paths.html [ Timeout ]
   http/tests/security/XFrameOptions/x-frame-options-deny-meta-tag-in-body.html [ Failure ]
   http/tests/security/XFrameOptions/x-frame-options-deny-meta-tag-parent-same-origin-allow.html [ Failure ]
   http/tests/security/XFrameOptions/x-frame-options-deny-meta-tag-parent-same-origin-deny.html [ Failure ]
   http/tests/security/XFrameOptions/x-frame-options-deny-meta-tag.html [ Failure ]
 
 # https://crbug.com/576270: Move mixed-content checks that happen during
 # navigation to the browser
-  http/tests/security/mixedContent/insecure-prefetch-in-main-frame.html [ Failure ]
   http/tests/security/mixedContent/nonwebby-scheme-in-iframe-allowed.https.html [ Timeout Failure ]
   http/tests/security/mixedContent/redirect-http-to-https-iframe-in-main-frame.html [ Failure ]
   http/tests/security/mixedContent/redirect-https-to-http-iframe-in-main-frame.html [ Failure ]
 
 # https://crbug.com/576271: PlzNavigate: support insecure request upgrade
   http/tests/security/upgrade-insecure-requests/https-header-auxiliary.html [ Failure ]
   http/tests/security/upgrade-insecure-requests/https-header-nested.html [ Failure ]
   http/tests/security/upgrade-insecure-requests/https-header-top-level.html [ Missing ]
   http/tests/security/upgrade-insecure-requests/iframe-upgrade.https.html [ Missing Timeout Timeout Timeout ]
   http/tests/security/w3c/cross-origin-objects.html [ Crash Timeout Failure ]
 
 # Untriaged navigation
-  compositing/gestures/gesture-tapHighlight-simple-navigate.html [ Failure ]
   fast/loader/document-destruction-within-unload.html [ Crash ]
   fast/loader/scroll-position-restored-on-reload-at-load-event.html [ Failure ]
   fast/loader/stateobjects/pushstate-with-fragment-urls-and-hashchange.html [ Crash Timeout ]
   fast/loader/subframe-removes-itself.html [ Failure ]
   http/tests/cache/smil-usecounter-in-cached-image.html [ Failure ]
   http/tests/cookies/same-site/popup-same-site-post.html [ Failure ]
   http/tests/cookies/same-site/popup-same-site.html [ Failure ]
   http/tests/loading/307-after-303-after-post.html [ Failure ]
   http/tests/loading/bad-scheme-subframe.html [ Timeout ]
   http/tests/loading/bad-server-subframe.html [ Failure ]
@@ skipping 28 matching lines @@
   fast/layout/scroll-anchoring/history-restore-anchors.html [ Failure ]
   fast/overflow/overflow-height-float-not-removed-crash.html [ Failure ]
   fast/overflow/overflow-height-float-not-removed-crash3.html [ Failure ]
   fast/table/giantCellspacing.html [ Failure ]
   http/tests/misc/policy-delegate-called-twice.html [ Failure ]
   http/tests/misc/window-dot-stop.html [ Failure ]
   http/tests/misc/window-open-then-write.html [ Timeout ]
   imported/wpt/html/semantics/embedded-content/the-object-element/object-attributes.html [ Failure ]
   plugins/object-onfocus-mutation-crash.html [ Timeout ]
   svg/custom/anchor-on-use.svg [ Failure ]
-  svg/dynamic-updates/SVGAElement-dom-href-attr.html [ Failure ]
-  svg/dynamic-updates/SVGAElement-dom-target-attr.html [ Failure ]
-  svg/dynamic-updates/SVGAElement-svgdom-href-prop.html [ Failure ]
-  svg/dynamic-updates/SVGAElement-svgdom-target-prop.html [ Failure ]
   virtual/pointerevent/fast/events/drag-file-crash.html [ Failure ]
   virtual/pointerevent/fast/events/iframe-object-onload.html [ Failure ]
   virtual/spv2/fast/overflow/overflow-height-float-not-removed-crash.html [ Failure ]
   virtual/spv2/fast/overflow/overflow-height-float-not-removed-crash2.html [ Timeout ]
   virtual/spv2/fast/overflow/overflow-height-float-not-removed-crash3.html [ Failure ]
 
 # https://crbug.com/440463: Make ServiceWorker and PlzNavigate play well
 # together.
   http/tests/serviceworker/appcache-ordering-main.html [ Failure ]
   http/tests/serviceworker/chromium/register-link-header.html [ Timeout Failure ]
@@ skipping 359 matching lines @@
   http/tests/streams/readable-streams/tee.html [ Failure ]
   http/tests/streams/readable-streams/templated.html [ Failure ]
   virtual/stable/http/tests/serviceworker/webexposed/global-interface-listing-service-worker.html [ Failure ]
   http/tests/inspector/elements/event-listeners-framework-with-service-worker.html [ Timeout ]
   http/tests/inspector/service-workers/service-worker-manager.html [ Timeout ]
   http/tests/inspector/service-workers/service-workers-view.html [ Timeout ]
   http/tests/security/contentSecurityPolicy/service-worker-allowed.html [ Timeout ]
   http/tests/serviceworker/chromium/resolve-after-window-close.html [ Timeout ]
   http/tests/serviceworker/getregistrations.html [ Timeout ]
   http/tests/serviceworker/foreign-fetch-workers.html [ Failure ]