PlzNavigate: store POST data in the FrameNavigationEntry

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
 
 # https://crbug.com/608371: PlzNavigate: properly execute the BeforeUnload event
   editing/pasteboard/file-drag-to-editable.html [ Crash Failure ]
   fast/events/before-unload-forbidden-navigation.html [ Crash ]
   fast/events/before-unload-return-value-from-listener.html [ Crash Failure ]
   fast/events/drop-handler-should-not-stop-navigate.html [ Crash Failure ]
   fast/loader/recursive-before-unload-crash.html [ Crash Failure ]
   http/tests/history/back-during-beforeunload.html [ Crash ]
   virtual/pointerevent/fast/events/before-unload-forbidden-navigation.html [ Crash ]
   virtual/pointerevent/fast/events/before-unload-return-value-from-listener.html [ Crash Failure ]
   virtual/pointerevent/fast/events/drop-handler-should-not-stop-navigate.html [ Crash Failure ]
   virtual/trustedeventsdefaultaction/fast/events/before-unload-forbidden-navigation.html [ Crash ]
   virtual/trustedeventsdefaultaction/fast/events/before-unload-return-value-from-listener.html [ Crash Failure ]
   virtual/trustedeventsdefaultaction/fast/events/drop-handler-should-not-stop-navigate.html [ Crash Failure ]
 
 # 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/cache/subresource-failover-to-network.html [ Crash ]
   http/tests/history/back-to-post.html [ Timeout ]
   http/tests/history/post-replace-state-reload.html [ Crash Failure ]
   http/tests/navigation/location-reload-after-post.php [ Crash Failure ]
-  http/tests/navigation/post-frames-goback1.html [ Failure ]
   http/tests/navigation/post-goback-same-url.html [ Failure ]
-  http/tests/navigation/post-goback1.html [ Crash Failure ]
-  http/tests/security/contentSecurityPolicy/1.1/form-action-src-redirect-blocked.html [ Failure ]
-  http/tests/security/xssAuditor/full-block-post-from-iframe.html [ Failure ]
-  http/tests/security/xssAuditor/post-from-iframe.html [ Failure ]
-  http/tests/security/xssAuditor/script-tag-post-control-char.html [ Failure ]
-  http/tests/security/xssAuditor/script-tag-post-null-char.html [ Failure ]
-  http/tests/security/xssAuditor/script-tag-post.html [ Failure ]
+  http/tests/security/xssAuditor/script-tag-post-redirect.html [ Failure ]
 
 # Failing due to error page supression in layout tests
   fast/xmlhttprequest/null-document-xmlhttprequest-open.html [ Crash Timeout ]
 
 # Failing due to empty data url
   editing/execCommand/apply-style-command-crash.html [ Crash ]
   editing/style/apply-style-crash.html [ Crash ]
   fast/frames/iframe-plugin-load-remove-document-crash.html [ Crash ]
   fast/loader/reload-zero-byte-plugin.html [ Crash ]
   http/tests/security/contentSecurityPolicy/object-src-does-not-affect-child.html [ Crash ]
@@ skipping 122 matching lines @@
   http/tests/navigation/response204.html [ Timeout ]
   http/tests/navigation/same-origin-fragment-navigation-is-sync.html [ Failure ]
   http/tests/navigation/scrollstate-after-http-equiv-refresh-fragment-identifier-2.html [ Timeout ]
   http/tests/navigation/scrollstate-after-http-equiv-refresh-fragment-identifier.html [ Timeout ]
   http/tests/navigation/scrollstate-after-http-equiv-refresh.html [ Timeout ]
   http/tests/navigation/scrollstate-after-location-reload.html [ Timeout ]
 
 # Untriaged security
   http/tests/security/frame-loading-via-document-write.html [ Failure ]
   http/tests/security/isolatedWorld/bypass-main-world-csp-iframes.html [ Failure ]
-  http/tests/security/xssAuditor/xss-filter-bypass-long-string.html [ Failure ]
-  http/tests/security/xssAuditor/xss-protection-parsing-01.html [ Failure ]
 
 # Untriaged other
   css3/fonts/font-style-matching-7.html [ Failure ]
   editing/selection/iframe.html [ Failure ]
   fast/css/acid2-pixel.html [ Crash Timeout Failure ]
   fast/css/acid2.html [ Crash Timeout Failure ]
   fast/css/preserve-user-specified-zoom-level-on-reload.html [ Failure ]
   fast/dom/frame-loading-via-document-write.html [ Failure ]
   fast/events/drag-file-crash.html [ Failure ]
   fast/layout/scroll-anchoring/history-restore-anchors.html [ Failure ]
@@ skipping 12 matching lines @@
   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 ]
   virtual/trustedeventsdefaultaction/fast/events/drag-file-crash.html [ Failure ]
   virtual/trustedeventsdefaultaction/fast/events/iframe-object-onload.html [ Failure ]