Suppress deprecation warning in CastShellActivity.

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastShellActivity.java

Index: chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastShellActivity.java
diff --git a/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastShellActivity.java b/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastShellActivity.java
index 4f36020b6d2285402a73df54045057f76554a5c0..6c576f55ee091d1a7d0a1aee00be44d679eb954e 100644
--- a/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastShellActivity.java
+++ b/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastShellActivity.java
@@ -171,19 +171,7 @@ public class CastShellActivity extends Activity {
             // On pre-M devices, the device should be "unmuted" at the end of a Cast application
             // session, signaled by the activity exiting. See b/19964892.
             if (Build.VERSION.SDK_INT < 23) {
-                AudioManager audioManager = CastAudioManager.getAudioManager(this);
-                boolean isMuted = false;
-                try {
-                    isMuted = (Boolean) audioManager.getClass().getMethod("isStreamMute", int.class)
-                            .invoke(audioManager, AudioManager.STREAM_MUSIC);
-                } catch (Exception e) {
-                    Log.e(TAG, "Cannot call AudioManager.isStreamMute().", e);
-                }
-
-                if (isMuted) {
-                    // Note: this is a no-op on fixed-volume devices.
-                    audioManager.setStreamMute(AudioManager.STREAM_MUSIC, false);
-                }
+                releaseStreamMuteIfNecessary();
             }
         }
 
@@ -236,6 +224,23 @@ public class CastShellActivity extends Activity {
         }
     }
 
+    @SuppressWarnings("deprecation")
+    private void releaseStreamMuteIfNecessary() {
+        AudioManager audioManager = CastAudioManager.getAudioManager(this);
+        boolean isMuted = false;
+        try {
+            isMuted = (Boolean) audioManager.getClass().getMethod("isStreamMute", int.class)
+                    .invoke(audioManager, AudioManager.STREAM_MUSIC);
+        } catch (Exception e) {
+            Log.e(TAG, "Cannot call AudioManager.isStreamMute().", e);
+        }
+
+        if (isMuted) {
+            // Note: this is a no-op on fixed-volume devices.
+            audioManager.setStreamMute(AudioManager.STREAM_MUSIC, false);
+        }
+    }
+
     private void registerBroadcastReceiver() {
         if (mBroadcastReceiver == null) {
             mBroadcastReceiver = new BroadcastReceiver() {