NetworkService: Remove stale disabled test lines for ServiceWorkerV8CacheStrategies*

These tests no longer exist.

Bug: 715640
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I51cf81a18df2b3740613b0c08c8eceb64424e747
TBR: shimazu
Reviewed-on: https://chromium-review.googlesource.com/1011524Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550497}

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

@@ -6,8 +6,6 @@
 -ServiceWorkerBrowserTest.ResponseFromHTTPServiceWorkerIsNotMarkedAsSecure
 -ServiceWorkerNavigationPreloadTest.CanceledByInterceptor
 -ServiceWorkerNavigationPreloadTest.RespondWithNavigationPreloadWithMimeSniffing
--ServiceWorkerV8CacheStrategiesAggressiveTest.V8CacheOnCacheStorage
--ServiceWorkerV8CacheStrategiesNormalTest.V8CacheOnCacheStorage
 -ServiceWorkerV8CodeCacheForCacheStorageTest.V8CacheOnCacheStorage
 -ServiceWorkerVersionBrowserTest.ServiceWorkerScriptHeader