Throw when blocking top-level navigation.

third_party/WebKit/LayoutTests/W3CImportExpectations

 # This file controls which subdirectories of the w3c test repos we do (or don't) import.
 #
 # This file acts as a blacklist; directories and files not listed here will automatically
 # be found and imported. The only exception is that the manual tests (i.e. those with a
 # filename ending with "-manual.html" or "-manual.htm") are never imported.
 
 # When removing blacklist entries:
 # * Comment out the line rather than deleting it, to show it is intentional
 # * Change [ Skip ] to [ Pass ]
 # * Add a leading comment: ## Owners: user@example.com
@@ skipping 347 matching lines @@
 imported/wpt/html/dom/reflection-sections.html [ Skip ]
 imported/wpt/html/dom/reflection-tabular.html [ Skip ]
 imported/wpt/html/dom/reflection-text.html [ Skip ]
 
 # Depends on unimported directories of web-platform-tests/.
 imported/wpt/html/browsers/browsing-the-web/read-text/load-text-plain.html [ Skip ]
 
 # crbug.com/498120: Using absolute URL links.
 imported/wpt/dom/events/EventTarget-dispatchEvent.html [ Skip ]
 imported/wpt/html/browsers/history/the-location-interface/location-stringifier.html [ Skip ]
+imported/wpt/html/browsers/history/the-location-interface/security_location_0.sub.htm [ Skip ]

[Mike West, 2016/09/28 12:26:13]

This test now fails because we're not running WPT, so the URL substitutions
don't happen. Our old behavior was disguising this failure, as the URL failure
would transparently fail. We now match Firefox's behavior for this test (when
loaded as a `file:` and not through `wptserve`.

 imported/wpt/html/dom/documents/dom-tree-accessors/document.title-07.html [ Skip ]
 imported/wpt/html/dom/documents/dom-tree-accessors/Document.currentScript.sub.html [ Skip ]
 imported/wpt/html/editing/dnd/the-draggable-attribute/draggable_attribute.html [ Skip ]
 imported/wpt/html/infrastructure/urls/terminology-0/document-base-url.html [ Skip ]
 imported/wpt/html/rendering/non-replaced-elements/the-page/body_text_00ffff-expected.html [ Skip ]
 imported/wpt/html/rendering/non-replaced-elements/the-page/body_text_00ffff.xhtml [ Skip ]
 imported/wpt/html/semantics/document-metadata/the-base-element/base_href_empty.html [ Skip ]
 imported/wpt/html/semantics/document-metadata/the-base-element/base_href_unspecified.html [ Skip ]
 imported/wpt/html/semantics/embedded-content/media-elements/audio_loop_base.html [ Skip ]
 imported/wpt/html/semantics/embedded-content/media-elements/error-codes/error.html [ Skip ]
@@ skipping 405 matching lines @@
 # crbug.com/441355: MutationObserver incorrect for replaceChild (causes timeout)
 imported/wpt/dom/nodes/MutationObserver-childList.html [ Skip ]
 
 # Untriaged: Test results contain local file paths
 imported/wpt/html/semantics/document-metadata/the-base-element/base_about_blank.html [ Skip ]
 imported/wpt/html/semantics/document-metadata/the-base-element/base_srcdoc.html [ Skip ]
 
 # Untriaged: Tests don't complete.
 imported/wpt/html/semantics/document-metadata/the-style-element/style-error-01.html [ Skip ]
 imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe-allowfullscreen.html [ Skip ]