Re-enable previously flaky #testShowingVoiceSearchButtonIfUrlBarIsEmpty

I verified this is no longer flaking with 500 local runs, I'll continue
to monitor in the coming days.

TBR=tedchoc@chromium.org

Bug: 1020381
Change-Id: I170649506ae0d958ee5e7921b4e11c5d90a548da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992364Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Commit-Queue: Brandon Wylie <wylieb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729595}

chrome/android/javatests/src/org/chromium/chrome/browser/omnibox/LocationBarLayoutTest.java

@@ -24,7 +24,6 @@ import org.chromium.base.ContextUtils;
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Feature;
-import org.chromium.base.test.util.FlakyTest;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
@@ -187,7 +186,6 @@ public class LocationBarLayoutTest {
 
     @Test
     @SmallTest
-    @FlakyTest(message = "https://crbug.com/1020381")
     @Restriction(UiRestriction.RESTRICTION_TYPE_PHONE)
     public void testShowingVoiceSearchButtonIfUrlBarIsEmpty() throws ExecutionException {
         setUrlBarTextAndFocus("");