Enable ninja_confirm_noop by default

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

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "chromium.webkit",
       "--builder",
       "Linux ChromiumOS GN",
@@ skipping 179 matching lines @@
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma",
       "--goma-dir",
       "[BUILD]/goma",
+      "--ninja-ensure-up-to-date",
       "--",
       "browser_tests",
       "browser_tests_run"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
     "cmd": [
       "python",
@@ skipping 79 matching lines @@
     "name": "[collect error] browser_tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import sys@@@",
       "@@@STEP_LOG_LINE@python.inline@print '%s wasn\\'t triggered' % sys.argv[1]@@@",
       "@@@STEP_LOG_LINE@python.inline@sys.exit(1)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   }
 ]