Stop to use contextmanager for goma.build_with_goma

scripts/slave/recipes/pdfium.expected/android.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'pdfium', 'url': 'https://pdfium.googlesource.com/pdfium.git'}]\ntarget_os = ['android']",
       "--patch_root",
       "pdfium",
@@ skipping 173 matching lines @@
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "preprocess_for_goma.start cloudtail",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "cmd": [
       "ninja",
+      "-j",
+      "50",
       "-C",
-      "[SLAVE_BUILD]/pdfium/out/debug_v8",
-      "-j",
-      "50"
+      "[SLAVE_BUILD]/pdfium/out/debug_v8"
     ],
     "name": "compile with ninja"
   },
   {
     "cmd": [],
     "name": "postprocess_for_goma"
   },
   {
     "cmd": [
       "python",
@@ skipping 46 matching lines @@
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/upload_goma_logs.py",
       "--upload-compiler-proxy-info",
       "--json-status",
       "[CACHE]/cipd/goma/jsonstatus",
       "--ninja-log-outdir",
       "[SLAVE_BUILD]/pdfium/out/debug_v8",
       "--ninja-log-compiler",
       "unknown",
       "--ninja-log-command",
-      "['ninja', '-C', Path('checkout', 'out','debug_v8'), '-j', 50]",
+      "['ninja', '-j', 50, '-C', Path('checkout', 'out','debug_v8')]",
       "--ninja-log-exit-status",
       "0",
       "--buildbot-buildername",
       "android",
       "--buildbot-mastername",
       "client.pdfium",
       "--buildbot-slavename",
       "test_slave"
     ],
     "env": {
@@ skipping 17 matching lines @@
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]