chromium: Move source package into own subdir.

Next, we're going to refactor update.sh and the first step is to ensure
that we keep everything related to sources into its own subdirectory to
not clutter up the main directory too much.

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

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

@@ -18,7 +18,7 @@ let
   callPackage = newScope chromium;
 
   chromium = {
-    source = callPackage ./source.nix {
+    source = callPackage ./source {
       inherit channel;
       # XXX: common config
       inherit useOpenSSL;