Bug 233461 Add button icons on the new preferences dialogr=mconnor

toolkit/components/passwordmgr/content/passwordManager.xul

@@ -83,9 +83,9 @@
             </tree>
             <separator class="thin"/>
             <hbox>
-              <button id="removeSignon" disabled="true"
+              <button id="removeSignon" disabled="true" icon="remove"
                       label="&remove.label;" oncommand="DeleteSignon();"/>
-              <button id="removeAllSignons"
+              <button id="removeAllSignons" icon="clear"
                       label="&removeall.label;"
                       oncommand="DeleteAllSignons();"/>
               <spacer flex="1"/>
@@ -108,10 +108,10 @@
             </tree>
             <separator class="thin"/>
             <hbox>
-              <button id="removeReject" disabled="true"
+              <button id="removeReject" disabled="true" icon="remove"
                       label="&remove.label;" oncommand="DeleteReject();"/>
               <button id="removeAllRejects"
-                      label="&removeall.label;"
+                      icon="clear" label="&removeall.label;"
                       oncommand="DeleteAllRejects();"/>
             </hbox>
         </vbox>