Add custom Polymer network icon element

ui/webui/resources/webui_resources.grd

Index: ui/webui/resources/webui_resources.grd
diff --git a/ui/webui/resources/webui_resources.grd b/ui/webui/resources/webui_resources.grd
index 38897fa747292246c366fe003ed59b0a88f3b2fd..bd93b688e8b062ebbb263789755461378d14f8e5 100644
--- a/ui/webui/resources/webui_resources.grd
+++ b/ui/webui/resources/webui_resources.grd
@@ -202,6 +202,8 @@ without changes to the corresponding grd file. -->
                file="images/trash.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_CLOUDS"
                file="images/clouds.png" type="BINDATA" />
+
+      <part file="cr_element_images.grdp" />
     </includes>
     <structures>
       <structure name="IDR_WEBUI_CSS_ALERT_OVERLAY"
@@ -376,8 +378,6 @@ without changes to the corresponding grd file. -->
                  file="js/parse_html_subset.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_UTIL"
                  file="js/util.js" type="chrome_html" flattenhtml="true" />
-      <structure name="IDR_WEBUI_JS_WEBUI_RESOURCE_TEST"
-                 file="js/webui_resource_test.js" type="chrome_html" />
       <if expr="chromeos">
         <structure name="IDR_WEBUI_CSS_UI_ACCOUNT_TWEAKS"
                    file="css/chromeos/ui_account_tweaks.css"
@@ -387,6 +387,7 @@ without changes to the corresponding grd file. -->
                    type="chrome_html" />
       </if>
       <part file="polymer_resources.grdp" />
+      <part file="cr_element_resources.grdp" />
     </structures>
   </release>
 </grit>