Disable flaky PartnerHomepageUnitTest#testProviderNotFromSystemPackage

TBR=wychen@chromium.org

Bug: 836700
Change-Id: I6c72f9404a3373030a65a4acb31597fb70cb0974
Reviewed-on: https://chromium-review.googlesource.com/1027550Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553491}

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

@@ -99,10 +99,12 @@ public class PartnerHomepageUnitTest {
 
     /**
      * Everything is enabled for using partner homepage, except that there is no flag file.
+     * Flaky: crbug.com/836700
      */
     @Test
     @SmallTest
     @Feature({"Homepage"})
+    @DisabledTest
     public void testProviderNotFromSystemPackage() throws InterruptedException {
         mHomepageManager.setPrefHomepageEnabled(true);
         mHomepageManager.setPrefHomepageUseDefaultUri(true);