MusicPicker needs to be exported.

This is the activity launched when people are doing a GET_CONTENT
that can return music.

Change-Id: I2d4dbbd70d0ff0e6fcecb535d98db504d9ccdb86
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index d9ff441..186a1e1 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -233,7 +233,7 @@
 -->
         </activity>
         <activity android:name="com.android.music.MusicPicker"
-                android:label="@string/music_picker_title" android:exported="false" >
+                android:label="@string/music_picker_title" android:exported="true" >
             <!-- First way to invoke us: someone asks to get content of
                  any of the audio types we support. -->
             <intent-filter>