AU: fix local compilation

This enables local compilation again. You may need to run:
sudo emerge -av1 libchrome
After receiving this patch to get local compilation

BUG=chromium-os:5672
TEST=CFLAGS=-O1 ./gen_coverage_html.sh

Review URL: http://codereview.chromium.org/3114010
diff --git a/SConstruct b/SConstruct
index a24586b..97444ef 100644
--- a/SConstruct
+++ b/SConstruct
@@ -168,8 +168,7 @@
                        ssl
                        xml2
                        z""")
-env['CPPPATH'] = ['..', '../../third_party/chrome/files', '../../common']
-env['LIBPATH'] = ['../../third_party/chrome']
+env['CPPPATH'] = ['..']
 env['BUILDERS']['ProtocolBuffer'] = proto_builder
 env['BUILDERS']['DbusBindings'] = dbus_bindings_builder
 env['BUILDERS']['GlibMarshal'] = glib_marshal_builder