EME: Address TODOs related to the removal of prefixed EME

media/base/android/java/src/org/chromium/media/MediaDrmBridge.java

 // Copyright 2013 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.media;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.media.MediaCrypto;
 import android.media.MediaDrm;
@@ skipping 734 matching lines @@
      * @param promiseId Promise ID of this call.
      */
     @CalledByNative
     private void updateSession(byte[] sessionId, byte[] response, long promiseId) {
         Log.d(TAG, "updateSession()");
         if (mMediaDrm == null) {
             onPromiseRejected(promiseId, "updateSession() called when MediaDrm is null.");
             return;
         }
 
-        // TODO(xhwang): DCHECK this now that prefixed EME is deprecated.
-        // https://crbug.com/249976
         if (!sessionExists(sessionId)) {
+            assert false; // Should never happen.
             onPromiseRejected(
                     promiseId, "Invalid session in updateSession: " + bytesToHexString(sessionId));
             return;
         }
 
         try {
             try {
                 mMediaDrm.provideKeyResponse(sessionId, response);
             } catch (java.lang.IllegalStateException e) {
                 // This is not really an exception. Some error code are incorrectly
@@ skipping 294 matching lines @@
     private native void nativeOnSessionKeysChange(long nativeMediaDrmBridge, byte[] sessionId,
             Object[] keysInfo, boolean hasAdditionalUsableKey);
     private native void nativeOnSessionExpirationUpdate(
             long nativeMediaDrmBridge, byte[] sessionId, long expirationTime);
     private native void nativeOnLegacySessionError(
             long nativeMediaDrmBridge, byte[] sessionId, String errorMessage);
 
     private native void nativeOnResetDeviceCredentialsCompleted(
             long nativeMediaDrmBridge, boolean success);
 }