Implementing timeout support for XHR

LayoutTests/TestExpectations

 # See http://trac.webkit.org/wiki/TestExpectations for more information on this file.
 
 crbug.com/237000 [ Win Linux ] virtual/gpu/fast/canvas/getPutImageDataPairTest.html [ Slow ]
 crbug.com/24182 [ Debug ] css3/flexbox/multiline-justify-content.html [ Slow ]
 webkit.org/b/82097 [ Debug ] editing/selection/move-by-word-visually-crash-test-5.html [ Slow ]
 webkit.org/b/92287 fast/canvas/webgl/context-creation-and-destruction.html [ Pass Timeout Failure ]
 webkit.org/b/92287 virtual/gpu/fast/canvas/webgl/context-creation-and-destruction.html [ Pass Timeout Failure ]
 crbug.com/24182 [ Debug ] fast/css/large-list-of-rules-crash.html [ Slow ]
 crbug.com/24182 [ Debug ] fast/dom/shadow/tree-scope-crash.html [ Slow ]
 crbug.com/24182 [ Debug ] fast/dom/Window/window-postmessage-clone-really-deep-array.html [ Slow ]
@@ skipping 229 matching lines @@
 # fast/css/display-none-inline-style-change-crash.html   somehow
 # the message is dumped after the #EOF, which causes an additional
 # 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/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 1440 matching lines @@
 # An exception is being thrown, causing tests to generate PNG output when they should not.
 crbug.com/239470 [ Mac ] fast/canvas/webgl [ Pass Missing ]
 crbug.com/239470 [ Mac ] fast/dom [ Pass Missing ]
 crbug.com/240700 [ Mac ] fast/css/getComputedStyle/computed-style-select-overflow.html [ Pass Missing ]
 crbug.com/240700 [ Mac ] fast/css/getComputedStyle/getComputedStyle-outline-offset.html [ Pass Missing ]
 crbug.com/240700 [ Mac ] fast/css/getComputedStyle/getComputedStyle-padding-shorthand.html [ Pass Missing ]
 
 # A result of crbug.com/237701 and r150365.
 Bug(ojan) virtual/softwarecompositing/lots-of-img-layers-with-opacity.html [ Pass Failure ImageOnlyFailure ]