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/241869 [ Debug ] css3/flexbox/multiline-justify-content.html [ Pass Timeout ]
 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 [ Failure Pass Timeout ]
 webkit.org/b/92287 virtual/gpu/fast/canvas/webgl/context-creation-and-destruction.html [ Failure Pass Timeout ]
 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 167 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 [ Skip ]
 
 # Test itself passes, but causes subsequent tests to fail.
 webkit.org/b/83260 fast/text/international/embed-bidi-style-in-isolate-crash.html [ Skip ]
 
 webkit.org/b/109415 editing/spelling/spellcheck-async.html [ Failure Pass ]
 
-# 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 ]
 
 crbug.com/67662 http/tests/inspector/console-websocket-error.html [ Failure Timeout ]
 
@@ skipping 1528 matching lines @@
 
 Bug(dpranke) [ Linux ] fast/writing-mode/broken-ideographic-font.html [ Failure ]
 
 # Test is now just slow (from webkit.org/b/62754)
 Bug(dpranke) http/tests/misc/object-embedding-svg-delayed-size-negotiation-2.htm [ Slow ]
 
 Bug(dpranke) virtual/gpu/compositedscrolling/overflow/remove-overflow-crash2.html [ Slow ]
 
 crbug.com/248541 [ Win7 Release ] virtual/gpu/fast/canvas/webgl/webgl-depth-texture.html [ Pass Crash ]
 crbug.com/248832 [ XP ] virtual/softwarecompositing/reflections/nested-reflection-anchor-point.html [ ImageOnlyFailure ]