Disable failing browser_tests with Network Service

After these changes there are two new browser_test failures:

 * https://chromium-review.googlesource.com/725385
 * https://chromium-review.googlesource.com/665657

The later failure appears to be an existing test failure uncovered by a
change which prevented the Network Service from being enabled during the
test run.

TBR=jam@chromium.org

Bug: 769401
Change-Id: If1d8af9fcfccc9491a5005bd545c1679e820045e
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/729521Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510245}

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

@@ -207,6 +207,7 @@
 -BrowserOnly/MemlogBrowserTest.EndToEndTracing/0
 -BrowserTest.CancelBeforeUnloadResetsURL
 -BrowserTest.InterstitialCancelsGuestViewDialogs
+-BrowsingDataRemoverBrowserTest.CookieDeletion
 -BrowsingDataRemoverBrowserTest.Database
 -CaptivePortalBrowserTest.AbortLoad
 -CaptivePortalBrowserTest.CloseLoginTab
@@ -2050,6 +2051,7 @@
 -NativeBindings/ExternallyConnectableMessagingTest.HostedAppOnWebsite/0
 -NativeBindings/ExternallyConnectableMessagingTest.WebConnectableAndNotConnectable/0
 -NativeBindingsApiTest.LazyListeners
+-NetworkTimePolicyTest.NetworkTimeQueriesDisabled
 -NewTabPageInterceptorTest.204Interception
 -NewTabPageInterceptorTest.404Interception
 -NewTabPageInterceptorTest.FailedRequestInterception