Disable ArcAccessibilityHelperBridgeBrowserTest.PreferenceChange on CrOS ASan

TBR=thakis@chromium.org
NOTRY=true

Bug: 807465
Change-Id: I217899e452758bd531eb800b3ed8ae761f8af4d7
Reviewed-on: https://chromium-review.googlesource.com/1105826Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568392}

testing/buildbot/filters/browser_tests_cros_asan.filter

@@ -3,3 +3,6 @@
 
 # TODO(crbug.com/778405): Test is flaky on CrOS with ASan.
 -MemoryTracingBrowserTest.TestBackgroundMemoryInfra
+
+# TODO(crbug.com/807465): Test is flaky on CrOS with ASan in viz_browser_tests.
+-ArcAccessibilityHelperBridgeBrowserTest.PreferenceChange