Update webview network service filter

Bot failing again, this time from http://crrev.com/c/1270096 which added
some new tests.

TBR=jam@chromium.org

Bug: 893572
Change-Id: I9cda2cf50cec142ddd22ffc665113e10404ca43f
Reviewed-on: https://chromium-review.googlesource.com/c/1289951Reviewed-by: Clark DuVall <cduvall@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600943}

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

@@ -107,7 +107,13 @@
 -org.chromium.android_webview.test.AwSettingsTest.testUniversalAccessFromFilesWithTwoViews
 
 # https://crbug.com/893572
+-org.chromium.android_webview.test.ClientOnPageStartedTest.testBrowserInitiatedHangingNavigation
+-org.chromium.android_webview.test.ClientOnPageStartedTest.testBrowserInitiatedRedirectHangingNavigation
+-org.chromium.android_webview.test.ClientOnPageStartedTest.testNotCalledForDownloadContentDisposition
+-org.chromium.android_webview.test.ClientOnPageStartedTest.testNotCalledForDownloadPdf
 -org.chromium.android_webview.test.ClientOnPageStartedTest.testOnPageStartedCalledOnceOnError
+-org.chromium.android_webview.test.ClientOnPageStartedTest.testRendererInitiatedHangingNavigation
+-org.chromium.android_webview.test.ClientOnPageStartedTest.testRendererInitiatedRedirectHangingNavigation
 
 # https://crbug.com/893573
 -org.chromium.android_webview.test.ClientOnReceivedError2Test.testIframeSubresource