[SP] Remove virtual/deferred tests as that code path is near-obsolete.

LayoutTests/SlowTests

 # See http://www.chromium.org/developers/testing/webkit-layout-tests/testexpectations for more information on this file.
 
 # This file should only mark tests as Slow. If they are failing in some other way, that listing should be in TestExpectations.
 # Lines listed in both files will have the *union* of the expectations.
 
 # In general, we should list tests in this file if they are slower than ~30% of the default timeout time, as we
 # can see a 3x variance or more in test times on the bots. In practice, this means that any test that takes longer
 # than 2 seconds in Release mode or 6 seconds in Debug mode should be listed here.
 
 crbug.com/24182 [ Debug ] storage/indexeddb/objectstore-cursor.html [ Slow ]
@@ skipping 68 matching lines @@
 crbug.com/237245 [ Debug Win7 ] editing/selection/programmatic-selection-on-mac-is-directionless.html [ Slow ]
 
 # FIXME: Most inspector tests are slow. We should triage and consolidate these bugs and figure out if any are unusually slow.
 webkit.org/b/60109 inspector/elements/edit/edit-dom-actions.html [ Slow ]
 webkit.org/b/84735 [ Win ] http/tests/inspector/change-iframe-src.html [ Slow ]
 webkit.org/b/90488 [ Debug ] inspector/ [ Slow ]
 webkit.org/b/90488 [ Debug ] http/tests/inspector/ [ Slow ]
 webkit.org/b/90488 [ Release ] http/tests/inspector/compiler-source-mapping-debug.html [ Slow ]
 webkit.org/b/90488 [ Debug ] http/tests/inspector-enabled/ [ Slow ]
 webkit.org/b/90488 [ Debug ] inspector-protocol/ [ Slow ]
-webkit.org/b/90488 [ Debug ] virtual/deferred/inspector/ [ Slow ]
 crbug.com/243492 http/tests/inspector-enabled/injected-script-discard.html [ Slow ]
 crbug.com/246190 [ Release ] http/tests/inspector/indexeddb/ [ Slow ]
 crbug.com/247466 [ Release ] inspector-enabled/sources/debugger/script-formatter-console.html [ Slow ]
 crbug.com/247466 [ Release ] inspector-enabled/sources/debugger/linkifier.html [ Slow ]
 crbug.com/247466 [ Release ] inspector/profiler/heap-snapshot-comparison-expansion-preserved-when-sorting.html [ Slow ]
 crbug.com/327078 http/tests/inspector/network/long-script-content.html [ Slow ]
 crbug.com/247466 [ Debug ] inspector-enabled/sources/debugger/script-formatter-breakpoints-1.html [ Slow ]
 crbug.com/247466 [ Debug ] inspector-enabled/sources/debugger/script-formatter-breakpoints-4.html [ Slow ]
 crbug.com/420008 [ Release ] inspector/tracing [ Slow ]
-crbug.com/420008 [ Release ] virtual/deferred/inspector/tracing [ Slow ]
 crbug.com/420008 [ Release ] inspector/editor/text-editor-word-jumps.html [ Slow ]
 crbug.com/420008 [ Release ] http/tests/inspector/console-xhr-logging.html [ Slow ]
 crbug.com/450493 inspector/sources/debugger [ Slow ]
 
 # This test is intentionally SLOW as we're waiting for a connection timeout.
 crbug.com/73609 http/tests/media/video-play-stall.html [ Slow ]
 
 # This test uses a throttled load to stay in NETWORK_LOADING.
 crbug.com/400659 http/tests/media/gc-while-network-loading.html [ Slow ]
 
@@ skipping 97 matching lines @@
 
 crbug.com/372424 http/tests/serviceworker/chromium/registration-stress.html [ Slow ]
 crbug.com/448670 http/tests/serviceworker/chromium/register-different-script-many-times.html [ Slow ]
 crbug.com/446121 http/tests/fetch/serviceworker/stream-reader.html [ Slow ]
 
 # Most crypto/subtle tests are slow some or most of the time.
 crbug.com/459009 crypto/subtle/ [ Slow ]
 
 crbug.com/24182 [ Debug ] animations/interpolation/transform-interpolation.html [ Slow ]
 crbug.com/24182 [ Debug ] animations/interpolation/webkit-transform-interpolation.html [ Slow ]