Reenable a content browser test with network service

Reenables the contentc browser test
GetUserMediaVideoCaptureBrowserTest.
RecoverFromCrashInVideoCaptureProcess with the network service as it
seems to be passing now.

Tbr: dpranke@chromium.org
Bug: 729848
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Iac6246c6f7205dee0791da39f1e08da39a62af47
Reviewed-on: https://chromium-review.googlesource.com/1033955Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554551}

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

@@ -33,7 +33,6 @@
 -PreviewsStateBrowserTest.ShouldEnableLoFiModeReloadDisableLoFi
 
 -AsyncResourceHandlerBrowserTest/AsyncResourceHandlerBrowserTest.UploadProgress*
--GetUserMediaVideoCaptureBrowserTest.RecoverFromCrashInVideoCaptureProcess
 -IsolatedDevToolsProtocolTest.ControlNavigationsChildFrames
 -NavigationHandleImplBrowserTest.ErrorCodeOnRedirect
 -NavigationHandleImplBrowserTest.RedirectToRendererDebugUrl