Disable Flaking viz_browser_test

StartupBrowserCreatorTest.ProfilesWithoutPagesNotLaunched is flaking with a
timeout on Windows in viz_browser_tests. Filtering it out.

TBR=kylechar@chromium.org
TEST=StartupBrowserCreatorTest.ProfilesWithoutPagesNotLaunched

Bug: 829300
Change-Id: I78a776cd133edc17caa9291612ac980d8c500943
Reviewed-on: https://chromium-review.googlesource.com/997758Reviewed-by: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548393}

testing/buildbot/filters/viz.browser_tests.filter

@@ -99,6 +99,7 @@
 -OmniboxPopupContentsViewTest.ThemeIntegration/*
 -PDFIsolatedExtensionTest.MultipleDomains
 -PrefHashBrowserTest*
+-StartupBrowserCreatorTest.ProfilesWithoutPagesNotLaunched
 -UserInitiatedRunsDisabled*
 -UserInitiatedRunsEnabled*
 -WithVaryingSeeds/ChromeCleanerPromptUserTest.*