popupMenu: Use the standard arrow icons popup menu arrows

Rather than our own theme asset.

data/Makefile.am

@@ -35,7 +35,6 @@ dist_theme_DATA =				\
 	theme/filter-selected-rtl.svg		\
 	theme/gnome-shell.css			\
 	theme/logged-in-indicator.svg		\
-	theme/menu-arrow-symbolic.svg		    \
 	theme/message-tray-background.png	\
 	theme/more-results.svg			\
 	theme/noise-texture.png			\

data/theme/menu-arrow-symbolic.svg

@@ -1,90 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!-- Created with Inkscape (http://www.inkscape.org/) -->
-
-<svg
-   xmlns:dc="http://purl.org/dc/elements/1.1/"
-   xmlns:cc="http://creativecommons.org/ns#"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   width="16"
-   height="16"
-   id="svg3863"
-   version="1.1"
-   inkscape:version="0.48.4 r9939"
-   sodipodi:docname="menu-arrow.svg">
-  <defs
-     id="defs3865" />
-  <sodipodi:namedview
-     id="base"
-     pagecolor="#ffffff"
-     bordercolor="#666666"
-     borderopacity="1.0"
-     inkscape:pageopacity="0.0"
-     inkscape:pageshadow="2"
-     inkscape:zoom="15.836083"
-     inkscape:cx="-3.1641676"
-     inkscape:cy="11.823817"
-     inkscape:current-layer="layer1"
-     showgrid="true"
-     inkscape:grid-bbox="true"
-     inkscape:document-units="px"
-     showguides="true"
-     inkscape:guide-bbox="true"
-     inkscape:window-width="1366"
-     inkscape:window-height="702"
-     inkscape:window-x="0"
-     inkscape:window-y="27"
-     inkscape:window-maximized="1"
-     inkscape:snap-bbox="true">
-    <sodipodi:guide
-       orientation="1,0"
-       position="15.996443,16.922964"
-       id="guide3873" />
-    <sodipodi:guide
-       orientation="0,1"
-       position="28.041217,3.1256134"
-       id="guide3875" />
-    <sodipodi:guide
-       orientation="0,1"
-       position="-0.80372916,24.469088"
-       id="guide3877" />
-    <sodipodi:guide
-       orientation="1,0"
-       position="3.0363102,34.649657"
-       id="guide3879" />
-    <sodipodi:guide
-       orientation="1,0"
-       position="29.023553,28.577037"
-       id="guide3881" />
-    <inkscape:grid
-       type="xygrid"
-       id="grid2988" />
-  </sodipodi:namedview>
-  <metadata
-     id="metadata3868">
-    <rdf:RDF>
-      <cc:Work
-         rdf:about="">
-        <dc:format>image/svg+xml</dc:format>
-        <dc:type
-           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-        <dc:title></dc:title>
-      </cc:Work>
-    </rdf:RDF>
-  </metadata>
-  <g
-     id="layer1"
-     inkscape:label="Layer 1"
-     inkscape:groupmode="layer"
-     transform="translate(0,-16)">
-    <path
-       style="fill:#ffffff;fill-opacity:1;stroke:none"
-       d="m 4,23 8,0 -4,5 z"
-       id="path3883"
-       inkscape:connector-curvature="0"
-       sodipodi:nodetypes="cccc" />
-  </g>
-</svg>

js/ui/popupMenu.js

@@ -46,33 +46,28 @@ function isPopupMenuItemVisible(child) {
  * @side Side to which the arrow points.
  */
 function arrowIcon(side) {
-    let rotation;
+    let iconName;
     switch (side) {
         case St.Side.TOP:
-            rotation = 180;
+            iconName = 'pan-up-symbolic';
             break;
         case St.Side.RIGHT:
-            rotation = - 90;
+            iconName = 'pan-end-symbolic';
             break;
         case St.Side.BOTTOM:
-            rotation = 0;
+            iconName = 'pan-down-symbolic';
             break;
         case St.Side.LEFT:
-            rotation = 90;
+            iconName = 'pan-start-symbolic';
             break;
     }
 
-    let gicon = new Gio.FileIcon({ file: Gio.File.new_for_path(global.datadir +
-                                             '/theme/menu-arrow-symbolic.svg') });
-
     let arrow = new St.Icon({ style_class: 'popup-menu-arrow',
-                              gicon: gicon,
+                              icon_name: 'pan-end-symbolic',
                               accessible_role: Atk.Role.ARROW,
                               y_expand: true,
                               y_align: Clutter.ActorAlign.CENTER });
 
-    arrow.rotation_angle_z = rotation;
-
     return arrow;
 }