Network service: triage failing content_browsertets

Moves some tests away from the untriaged ones now that they have a bug
assigned to them.

TBR=jam@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I5351246477fe0ed35c5c87b1e937bc27006d354d
Reviewed-on: https://chromium-review.googlesource.com/955583
Commit-Queue: Camille Lamy <clamy@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541789}

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

@@ -35,6 +35,13 @@
 -DataUrlNavigationBrowserTest.PDF_NavigationFromFrame_Block
 -DataUrlNavigationBrowserTest.PDF_NavigationFromFrame_TopFrameIsDataURL_Block
 
+# http://crbug.com/820060
+-PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeNavigateBackThenForward
+-PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeOff
+-PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeOn
+-PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeReload
+-PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeReloadDisableLoFi
+
 -AsyncResourceHandlerBrowserTest/AsyncResourceHandlerBrowserTest.UploadProgress*
 -DevToolsDownloadContentTest.MultiDownload
 -DevToolsDownloadContentTest.DefaultDownload
@@ -51,11 +58,6 @@
 -PowerMonitorTest.TestGpuProcess
 -PowerMonitorTest.TestRendererProcess
 -PowerMonitorTest.TestUtilityProcess
--PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeNavigateBackThenForward
--PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeOff
--PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeOn
--PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeReload
--PreviewsStateResourceDispatcherHostBrowserTest.ShouldEnableLoFiModeReloadDisableLoFi
 -RenderViewBrowserTest.ConfirmCacheInformationPlumbed
 -RequestDataResourceDispatcherHostBrowserTest.Basic
 -RequestDataResourceDispatcherHostBrowserTest.BasicCrossSite