Android: Add content provider support to File::Delete

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/ContentHandler.java

@@ -1,6 +1,8 @@
 package org.dolphinemu.dolphinemu.utils;
 
+import android.content.ContentResolver;
 import android.net.Uri;
+import android.provider.DocumentsContract;
 
 import org.dolphinemu.dolphinemu.DolphinApplication;
 
@@ -20,4 +22,18 @@ public class ContentHandler
       return -1;
     }
   }
+
+  public static boolean delete(String uri)
+  {
+    try
+    {
+      ContentResolver resolver = DolphinApplication.getAppContext().getContentResolver();
+      return DocumentsContract.deleteDocument(resolver, Uri.parse(uri));
+    }
+    catch (FileNotFoundException e)
+    {
+      // Return true because we care about the file not being there, not the actual delete.
+      return true;
+    }
+  }
 }