Disable ClearBrowsingDataFragmentTest#testImportantSitesDialog

This test was failing on KitKat phone tester.

BUG=946722,999361
TBR=dullweber@chromium.org

Change-Id: Ib0d0852dc6b2b2eb1ddfe3739a3ad9942de6e3d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106034Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750831}

chrome/android/javatests/src/org/chromium/chrome/browser/browsing_data/ClearBrowsingDataFragmentTest.java

@@ -490,6 +490,7 @@ public class ClearBrowsingDataFragmentTest {
     @Test
     @MediumTest
     @Feature({"SiteEngagement"})
+    @DisabledTest(message = "crbug.com/999361")
     public void testImportantSitesDialog() throws Exception {
         // Sign in.
         SigninTestUtil.addAndSignInTestAccount();