Fix disable_nacl=1 build.

This was broken in https://codereview.chromium.org/61763014: gyp complains that
native_client_sdk/native_client_sdk_untrusted.gyp, included from build/all.gyp,
has no targets.

BUG=319174
R=binji@chromium.org, jochen@chromium.org

Review URL: https://codereview.chromium.org/66163013

git-svn-id: http://src.chromium.org/svn/trunk/src/build@235114 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -72,7 +72,6 @@
             '../webkit/glue/webkit_glue.gyp:*',
             '../webkit/renderer/compositor_bindings/compositor_bindings_tests.gyp:*',
             '<(libjpeg_gyp_path):*',
-            '../native_client_sdk/native_client_sdk_untrusted.gyp:*',
           ],
         }, { #  'OS=="ios"'
           'dependencies': [