Mac x86_64: package nacl_irt_x86_64.nexe.

BUG=18323
Review URL: https://codereview.chromium.org/12441004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186281 0039d316-1c4b-4281-b951-d872f2087c98

chrome/chrome_dll_bundle.gypi

@@ -157,9 +157,17 @@
         ['disable_nacl!=1', {
           'files': [
             '<(PRODUCT_DIR)/ppGoogleNaClPluginChrome.plugin',
-            # We leave out the x86-64 IRT nexe because we only
-            # support x86-32 NaCl on Mac OS X.
-            '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
+          ],
+          'conditions': [
+            ['target_arch=="x64"', {
+              'files': [
+                '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe',
+              ],
+            }, {
+              'files': [
+                '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
+              ],
+            }],
           ],
         }],
       ],