publish_tarball: fetch nacl source dependencies in addition to pnacl

scripts/slave/recipes/infra/publish_tarball.expected/basic.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "chromium.testing.master",
       "--builder",
       "TestBuilder",
@@ skipping 761 matching lines @@
       "\nimport shutil\nimport sys\nshutil.copytree(sys.argv[1], sys.argv[2], symlinks=bool(sys.argv[3]))\n",
       "[SLAVE_BUILD]/src",
       "[TMP_BASE]/tmp_tmp_5/src",
       "1"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "copytree (2)"
   },
   {
     "cmd": [
+      "make",
+      "-C",
+      "[TMP_BASE]/tmp_tmp_5/src/native_client/tools",
+      "sync-pinned"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "download nacl toolchain dependencies"
+  },
+  {
+    "cmd": [
       "python",
       "-u",
       "[TMP_BASE]/tmp_tmp_5/src/native_client/toolchain_build/toolchain_build_pnacl.py",
       "--verbose",
       "--sync",
       "--sync-only",
       "--disable-git-cache"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "download nacl toolchain dependencies"
+    "name": "download pnacl toolchain dependencies"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[chromium]/resources/export_tarball.py",
       "--remove-nonessential-files",
       "chromium-38.0.2125.122",
       "--verbose",
       "--progress",
@@ skipping 90 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import os, sys@@@",
       "@@@STEP_LOG_LINE@python.inline@from common import chromium_utils@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@if os.path.exists(sys.argv[1]):@@@",
       "@@@STEP_LOG_LINE@python.inline@  chromium_utils.RemoveDirectory(sys.argv[1])@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   }
 ]