Archiving the appropriate irt symbols bitage for 64-bit mac official builds.

We only recently started doing mac 64-bit official builds.
The archival list for debug symbols assumed only a 32-bit mac build.

BUG=None
TEST=None
R=kerz@chromium.org, kerz@google.com

Review URL: https://codereview.chromium.org/17029019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207939 0039d316-1c4b-4281-b951-d872f2087c98

chrome/tools/build/mac/FILES.cfg

@@ -57,6 +57,13 @@ FILES = [
   },
   {
     'filename': 'nacl_irt_x86_32.nexe.debug',
+    'arch': ['32bit'],
+    'buildtype': ['official'],
+    'archive': 'chrome-mac-nacl-irt-syms.zip',
+  },
+  {
+    'filename': 'nacl_irt_x86_64.nexe.debug',
+    'arch': ['64bit'],
     'buildtype': ['official'],
     'archive': 'chrome-mac-nacl-irt-syms.zip',
   },