Implementing timeout support for XHR

LayoutTests/TestExpectations

 # See http://trac.webkit.org/wiki/TestExpectations for more information on this file.
 
 # -----------------------------------------------------------------
 # SLOW TESTS
 # -----------------------------------------------------------------
 
 crbug.com/24182 [ Debug ] css3/flexbox/multiline-justify-content.html [ Slow ]
 webkit.org/b/91666 [ Mac ] editing/input/emacs-ctrl-o.html [ Failure Slow ]
 webkit.org/b/91666 [ Mac ] editing/pasteboard/emacs-ctrl-k-y-001.html [ Failure Slow ]
 webkit.org/b/91666 [ Mac ] editing/pasteboard/emacs-ctrl-a-k-y.html [ Failure Slow ]
@@ skipping 363 matching lines @@
 # error in the header of the following test.
 crbug.com/24197 fast/css/disabled-author-styles.html
 
 # Test itself passes, but causes subsequent tests to fail.
 webkit.org/b/83260 fast/text/international/embed-bidi-style-in-isolate-crash.html
 
 webkit.org/b/105005 [ Debug ] fast/css/variables/case-insensitive.html [ Pass Crash ]
 
 webkit.org/b/109415 editing/spelling/spellcheck-async.html [ Pass Failure ]
 
-# ResourceRequest needs to support setTimeoutInterval
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-aborted.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-abortedonmain.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-overridesexpires.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-simple.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-synconmain.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-twice.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-worker-aborted.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-worker-overridesexpires.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-worker-simple.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-worker-synconworker.html [ Skip ]
-webkit.org/b/98397 http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-worker-twice.html [ Skip ]
-
 # -----------------------------------------------------------------
 # Inspector tests
 # -----------------------------------------------------------------
 
 # There is no enough plugins support in DRT
 crbug.com/233124 http/tests/inspector/network/network-embed.html [ Skip ]
 crbug.com/233124 http/tests/inspector/network/network-content-replacement-embed.html [ Skip ]
 
 webkit.org/b/91435 http/tests/inspector/extensions-ignore-cache.html [ Pass Timeout ]
 webkit.org/b/91435 [ Linux Mac ] inspector/timeline/timeline-network-received-data.html [ Failure Pass ]
@@ skipping 2652 matching lines @@
 
 crbug.com/233223 http/tests/history/redirect-js-location-href-0-seconds.html [ Pass Failure ]
 crbug.com/233260 [ Win ] fast/preloader/script.html [ Failure ]
 
 crbug.com/233585 media/media-document-audio-repaint.html [ ImageOnlyFailure ]
 crbug.com/233700 [ Win Debug ] inspector/debugger/debugger-script-preprocessor.html [ Timeout ]
 
 crbug.com/234061 [ MountainLion ] fast/regions/shape-inside/shape-inside-recursive-layout.html [ ImageOnlyFailure ]
 crbug.com/234066 fast/dom/everything-to-string.html [ Pass Failure ]
 crbug.com/234069 [ Mac Release ] fast/events/touch/gesture/long-press-drag-drop-touch-editing-combined.html [ Pass Failure ]