Fix OverviewListLayoutTest.testCanCloseWithCloseButton for chrome modern

R=twellington@chromium.org

Change-Id: I074521c0835fe6d71cfa19fef359cd2f6bd42db9
Reviewed-on: https://chromium-review.googlesource.com/1178561Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Siddhartha S <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583806}

chrome/android/javatests/src/org/chromium/chrome/browser/widget/OverviewListLayoutTest.java

@@ -218,8 +218,13 @@ public class OverviewListLayoutTest {
             }
         });
 
-        TestTouchUtils.performClickOnMainSync(
-                InstrumentationRegistry.getInstrumentation(), item.findViewById(R.id.close_btn));
+        if (FeatureUtilities.isChromeModernDesignEnabled()) {
+            TestTouchUtils.performClickOnMainSync(InstrumentationRegistry.getInstrumentation(),
+                    item.findViewById(R.id.close_btn_modern));
+        } else {
+            TestTouchUtils.performClickOnMainSync(InstrumentationRegistry.getInstrumentation(),
+                    item.findViewById(R.id.close_btn));
+        }
 
         didReceiveClosureCommittedHelper.waitForCallback(0);