Fix NaCl IPC proxy untrusted build on arm.

BUG=116317
TEST=compiles
TBR=bbudge@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10831331

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151699 0039d316-1c4b-4281-b951-d872f2087c98

chrome/nacl.gypi

@@ -80,6 +80,10 @@
             ['disable_nacl_untrusted==0', {
               'dependencies': [
                 '../ppapi/native_client/native_client.gyp:nacl_irt',
+              ],
+            }],
+            ['disable_nacl_untrusted==0 and target_arch!="arm"', {
+              'dependencies': [
                 '../ppapi/native_client/native_client.gyp:nacl_ipc_irt',
               ],
             }],