Address NewApi Android lint warnings in src/media.

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

Index: media/base/android/java/src/org/chromium/media/MediaDrmBridge.java
diff --git a/media/base/android/java/src/org/chromium/media/MediaDrmBridge.java b/media/base/android/java/src/org/chromium/media/MediaDrmBridge.java
index 8f411ddea87e70cad7d7cc7dc60c016b00df8f23..ea97ca0e4452d2b9ccc9c093b061ef9fbd8cba7f 100644
--- a/media/base/android/java/src/org/chromium/media/MediaDrmBridge.java
+++ b/media/base/android/java/src/org/chromium/media/MediaDrmBridge.java
@@ -4,9 +4,11 @@
 
 package org.chromium.media;
 
+import android.annotation.TargetApi;
 import android.media.MediaCrypto;
 import android.media.MediaDrm;
 import android.os.AsyncTask;
+import android.os.Build;
 import android.os.Handler;
 import android.util.Log;
 
@@ -32,6 +34,7 @@ import java.util.UUID;
  * sessions for a single MediaSourcePlayer.
  */
 @JNINamespace("media")
+@TargetApi(Build.VERSION_CODES.KITKAT)
 public class MediaDrmBridge {
     // Implementation Notes:
     // - A media crypto session (mMediaCryptoSession) is opened after MediaDrm
@@ -198,6 +201,7 @@ public class MediaDrmBridge {
 
         // Create MediaCrypto object.
         try {
+            // TODO: This requires KitKat. Is this class used on pre-KK devices?
             if (MediaCrypto.isCryptoSchemeSupported(mSchemeUUID)) {
                 mMediaCrypto = new MediaCrypto(mSchemeUUID, mMediaCryptoSession);
                 Log.d(TAG, "MediaCrypto successfully created!");