chromium: Fix desktop icon and duplicate entry.

This should fix the desktop icon location for both desktop entries (the
one from the Chromium derivation itself and the wrapper) and renames the
name of the file so that it gets overridden by the wrappers desktop item
so we don't end up having two of them.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/applications/networking/browsers/chromium/default.nix

@@ -39,9 +39,9 @@ let
   };
 
   desktopItem = makeDesktopItem {
-    name = "Chromium";
+    name = "chromium";
     exec = "chromium";
-    icon = "chromium";
+    icon = "${chromium.browser}/share/icons/hicolor/48x48/apps/chromium.png";
     comment = "An open source web browser from Google";
     desktopName = "Chromium";
     genericName = "Web browser";
@@ -74,6 +74,7 @@ in stdenv.mkDerivation {
       --set CHROMIUM_SANDBOX_BINARY_PATH "${sandboxBinary}" \
       --add-flags "${chromium.plugins.flagsEnabled}"
 
+    ln -s "${chromium.browser}/share/icons" "$out/share/icons"
     cp -v "${desktopItem}/share/applications/"* "$out/share/applications"
   '';