Disable a content_browsertest when using the network service.

RenderFrameHostImplBrowserTest.AbortedRendererInitiatedNavigationDoNotCancelPendingXHR
is now failing, possibly due to https://chromium-review.googlesource.com/663140

TBR: jam@chromium.org
NOTRY: true
Bug: 576261,762945
Change-Id: Ib9a8893e105444be13653438c6bd364511dcfad7
Reviewed-on: https://chromium-review.googlesource.com/665070Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501659}

testing/buildbot/filters/mojo.fyi.network_content_browsertests.filter

@@ -100,6 +100,7 @@
 -PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeOn
 -PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeReload
 -PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeReloadDisableLoFi
+-RenderFrameHostImplBrowserTest.AbortedRendererInitiatedNavigationDoNotCancelPendingXHR
 -RenderFrameHostImplBrowserTest.StreamHandleReleasedOnRendererCrash
 -RenderThreadImplBrowserTest.NonResourceDispatchIPCTasksDontGoThroughScheduler
 -RenderThreadImplBrowserTest.ResourceDispatchIPCTasksGoThroughScheduler
@@ -121,9 +122,9 @@
 -ResourceDispatcherHostBrowserTest.CrossSiteNavigationNonBuffered
 -ResourceDispatcherHostBrowserTest.CrossSiteNoUnloadOn204
 -ResourceDispatcherHostBrowserTest.DoNotSniffHTMLFromImageGIF
--ResourceDispatcherHostBrowserTest.DoNotSniffHTMLFromTextPlain
+-ResourceDispatcherHostBrowserTest.DoNotSniffHTMLFromTextPlain
 -ResourceDispatcherHostBrowserTest.PageTransitionClientRedirect
--ResourceDispatcherHostBrowserTest.RespectNoSniffDirective
+-ResourceDispatcherHostBrowserTest.RespectNoSniffDirective
 -ResourceDispatcherHostBrowserTest.SniffHTMLWithNoContentType
 -ResourceDispatcherHostBrowserTest.SniffNoContentTypeNoData
 -SessionHistoryTest.HistoryLength