Enable ninja_confirm_noop by default

scripts/slave/recipes/chromium.expected/full_chromium_webkit_WebKit_Mac_Builder.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "chromium.webkit",
       "--builder",
       "WebKit Mac Builder",
@@ skipping 217 matching lines @@
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma-clang",
       "--goma-dir",
       "[BUILD]/goma",
+      "--ninja-ensure-up-to-date",
       "--",
       "blink_tests",
       "browser_tests",
       "browser_tests_run"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
     "cmd": [
@@ skipping 47 matching lines @@
       "public-read",
       "--factory-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"WebKit Mac Builder\", \"buildnumber\": 571, \"gs_acl\": \"public-read\", \"mastername\": \"chromium.webkit\", \"parent_buildername\": null, \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"WebKit Mac Builder\", \"buildnumber\": 571, \"gs_acl\": \"public-read\", \"mastername\": \"chromium.webkit\", \"parent_buildername\": null, \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "package build"
   }
 ]