[Media>UI] Apply throttling if the notification is updated too frequently

chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationManagerTestBase.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationManagerTestBase.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationManagerTestBase.java b/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationManagerTestBase.java
index ab19b76c6ee1c779cc98260de27c5f23a72fd19a..259c0b27f1f61adb95751cac9bab37b05455063d 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationManagerTestBase.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationManagerTestBase.java
@@ -23,6 +23,7 @@ import android.os.Build;
 import android.support.v4.media.session.MediaSessionCompat;
 import android.view.KeyEvent;
 
+import org.junit.After;
 import org.junit.Before;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
@@ -135,6 +136,11 @@ public class MediaNotificationManagerTestBase {
         CommandLine.init(null);
     }
 
+    @After
+    public void tearDown() {
+        MediaNotificationManager.clear(NOTIFICATION_ID);
+    }
+
     MediaNotificationManager getManager() {
         return MediaNotificationManager.getManager(getNotificationId());
     }