Link MediaSessionTabHelper with native MediaSession [CL is going to be split]

chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationTitleUpdatedTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationTitleUpdatedTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationTitleUpdatedTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationTitleUpdatedTest.java
index 2720de1e540665438bfceda326ea41156bdd8ae9..2a81c352d4f1d52068c9baf08a252acac5e6b3b7 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationTitleUpdatedTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/NotificationTitleUpdatedTest.java
@@ -11,7 +11,6 @@ import android.test.suitebuilder.annotation.SmallTest;
 import android.view.View;
 import android.widget.TextView;
 
-import org.chromium.base.ObserverList;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.base.test.util.RetryOnFailure;
@@ -24,7 +23,6 @@ import org.chromium.chrome.test.util.browser.TabTitleObserver;
 import org.chromium.content.browser.test.util.Criteria;
 import org.chromium.content.browser.test.util.CriteriaHelper;
 import org.chromium.content.browser.test.util.JavaScriptUtils;
-import org.chromium.content_public.browser.WebContentsObserver;
 import org.chromium.content_public.common.MediaMetadata;
 
 /**
@@ -150,11 +148,9 @@ public class NotificationTitleUpdatedTest extends ChromeActivityTestCaseBase<Chr
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
                 @Override
                 public void run() {
-                    ObserverList.RewindableIterator<WebContentsObserver> observers =
-                            tab.getWebContents().getObserversForTesting();
-                    while (observers.hasNext()) {
-                        observers.next().mediaSessionStateChanged(isControllable, isSuspended);
-                    }
+                    MediaSessionTabHelper.getHelperFromTabForTesting(tab)
+                            .getMediaSessionDelegateForTesting()
+                            .mediaSessionStateChanged(isControllable, isSuspended);
                 }
             });
     }
@@ -163,11 +159,9 @@ public class NotificationTitleUpdatedTest extends ChromeActivityTestCaseBase<Chr
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
-                ObserverList.RewindableIterator<WebContentsObserver> observers =
-                        tab.getWebContents().getObserversForTesting();
-                while (observers.hasNext()) {
-                    observers.next().mediaSessionMetadataChanged(metadata);
-                }
+                MediaSessionTabHelper.getHelperFromTabForTesting(tab)
+                        .getMediaSessionDelegateForTesting()
+                        .mediaSessionMetadataChanged(metadata);
             }
         });
     }