[java] Removing unused and deprecated internal class.

Author: diemol

java/spotbugs-excludes.xml

@@ -199,11 +199,6 @@
     <Bug pattern="NM_SAME_SIMPLE_NAME_AS_INTERFACE" />
   </Match>
 
-  <Match>
-    <Class name="org.openqa.selenium.remote.internal.WebElementToJsonConverter" />
-    <Bug pattern="NM_SAME_SIMPLE_NAME_AS_SUPERCLASS" />
-  </Match>
-
   <Match>
     <Class name="org.openqa.selenium.chrome.AddHasCasting" />
     <Bug pattern="NM_SAME_SIMPLE_NAME_AS_SUPERCLASS" />