Disable flaky PartnerHomepageUnitTest

Tbr: wychen
Bug: 837130
Change-Id: Iabc0c4f12266865ff91cd337461830db30f6067f
Reviewed-on: https://chromium-review.googlesource.com/1029850Reviewed-by: Max Morin <maxmorin@chromium.org>
Commit-Queue: Max Morin <maxmorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553947}

chrome/android/javatests/src/org/chromium/chrome/browser/partnercustomizations/PartnerHomepageUnitTest.java

@@ -293,6 +293,7 @@ public class PartnerHomepageUnitTest {
     @Test
     @SmallTest
     @Feature({"Homepage"})
+    @DisabledTest
     public void testHomepageProviderDelayed() throws InterruptedException {
         mHomepageManager.setPrefHomepageEnabled(true);
         mHomepageManager.setPrefHomepageUseDefaultUri(true);