PlzNavigate: update layout_test filters

This CL removes 3 ServiceWorker tests from the exclusion filter for
layout_tests with PlzNavigate enabled. They are now working.

BUG=440463
TBR=nasko@chromium.org

Review-Url: https://codereview.chromium.org/2386643002
Cr-Commit-Position: refs/heads/master@{#422792}

third_party/WebKit/LayoutTests/FlagExpectations/enable-browser-side-navigation

@@ -165,6 +165,3 @@
   http/tests/serviceworker/appcache-ordering-main.html [ Failure ]
   http/tests/serviceworker/chromium/register-link-header.html [ Timeout Failure ]
   http/tests/serviceworker/chromium/sandboxed-iframe-navigator-serviceworker.html [ Failure ]
-  http/tests/serviceworker/fetch-request-fallback.html [ Failure ]
-  http/tests/serviceworker/navigation-redirect.html [ Failure ]
-  http/tests/serviceworker/request-end-to-end.html [ Failure ]