[Android] Fix crash when closing tab during infobar cancellation

chrome/android/javatests/src/org/chromium/chrome/browser/infobar/InfoBarContainerTest.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.infobar;
 
 import android.graphics.Rect;
 import android.graphics.Region;
 import android.os.Environment;
 import android.test.suitebuilder.annotation.MediumTest;
@@ skipping 28 matching lines @@
         public final CallbackHelper dismissedCallback = new CallbackHelper();
         public final CallbackHelper primaryButtonCallback = new CallbackHelper();
         public final CallbackHelper secondaryButtonCallback = new CallbackHelper();
 
         @Override
         public void onInfoBarDismissed() {
             dismissedCallback.notifyCalled();
         }
 
         @Override
-        public void onInfoBarButtonClicked(boolean isPrimary) {
+        public boolean onInfoBarButtonClicked(boolean isPrimary) {
             if (isPrimary) {
                 primaryButtonCallback.notifyCalled();
             } else {
                 secondaryButtonCallback.notifyCalled();
             }
+            return false;
         }
     }
 
     private InfoBarTestAnimationListener mListener;
     private EmbeddedTestServer mTestServer;
 
     public InfoBarContainerTest() {
         super(ChromeActivity.class);
     }
 
@@ skipping 291 matching lines @@
         // Additional manual test that this is working:
         // - adb shell dumpsys SurfaceFlinger
         // - Observe that Clank's overlay size changes (or disappears if URLbar is also gone).
     }
 
     @Override
     public void startMainActivity() throws InterruptedException {
         startMainActivityOnBlankPage();
     }
 }