[TTS] Reenable a flaky test on some releases.

Reenables a test that was slightly flaky and disabled earlier today.
This test seems to be pretty solid on older builds of Android, so
enabling conditionally.

BUG=841017,837996

Change-Id: I172a2c859d2a85d922319003a525d65fd44d01a5
Reviewed-on: https://chromium-review.googlesource.com/1053101Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557908}

chrome/android/javatests/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManagerTest.java

@@ -1443,7 +1443,8 @@ public class ContextualSearchManagerTest {
      * Tests that a Tap gesture followed by scrolling clears the selection.
      */
     @Test
-    @DisabledTest(message = "crbug.com/841017")
+    @DisableIf.
+    Build(sdk_is_greater_than = Build.VERSION_CODES.LOLLIPOP, message = "crbug.com/841017")
     @SmallTest
     @Feature({"ContextualSearch"})
     public void testTapGestureFollowedByScrollClearsSelection()