goma: back to build-provided client and disable oauth2

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

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.webkit",
       "--builder",
       "WebKit Mac Builder",
@@ skipping 83 matching lines @@
       "@@@SET_BUILD_PROPERTY@got_angle_revision@\"fac9503c46405f77757b9a728eb85b8d7bc6080c\"@@@",
       "@@@SET_BUILD_PROPERTY@got_v8_revision@\"801ada225ddc271c132c3a35f03975671d43e399\"@@@",
       "@@@SET_BUILD_PROPERTY@got_v8_revision_cp@\"refs/heads/master@{#43426}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_swarming_client_revision_cp@\"refs/heads/master@{#276089}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_webrtc_revision_cp@\"refs/heads/master@{#120644}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_revision_cp@\"refs/heads/master@{#170242}\"@@@",
       "@@@SET_BUILD_PROPERTY@got_angle_revision_cp@\"refs/heads/master@{#297276}\"@@@"
     ]
   },
   {
-    "cmd": [],
-    "cwd": "[SLAVE_BUILD]",
-    "name": "ensure_goma"
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
-      "RECIPE_MODULE[build::cipd]/resources/bootstrap.py",
-      "--platform",
-      "mac-amd64",
-      "--dest-directory",
-      "[SLAVE_BUILD]/cipd",
-      "--json-output",
-      "/path/to/tmp/json"
-    ],
-    "cwd": "[SLAVE_BUILD]",
-    "name": "ensure_goma.install cipd",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@",
-      "@@@STEP_TEXT@cipd instance_id: 40-chars-fake-of-the-package-instance_id@@@",
-      "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"executable\": \"[SLAVE_BUILD]/cipd/cipd\", @@@",
-      "@@@STEP_LOG_LINE@json.output@  \"instance_id\": \"40-chars-fake-of-the-package-instance_id\"@@@",
-      "@@@STEP_LOG_LINE@json.output@}@@@",
-      "@@@STEP_LOG_END@json.output@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "[SLAVE_BUILD]/cipd/cipd",
-      "ensure",
-      "--root",
-      "[CACHE]/cipd/goma",
-      "--list",
-      "infra_internal/goma/client/mac-amd64 release",
-      "--json-output",
-      "/path/to/tmp/json",
-      "--service-account-json",
-      "/creds/service_accounts/service-account-goma-client.json"
-    ],
-    "cwd": "[SLAVE_BUILD]",
-    "name": "ensure_goma.ensure_installed",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@",
-      "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"result\": [@@@",
-      "@@@STEP_LOG_LINE@json.output@    {@@@",
-      "@@@STEP_LOG_LINE@json.output@      \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"package\": \"infra_internal/goma/client/mac-amd64\"@@@",
-      "@@@STEP_LOG_LINE@json.output@    }@@@",
-      "@@@STEP_LOG_LINE@json.output@  ]@@@",
-      "@@@STEP_LOG_LINE@json.output@}@@@",
-      "@@@STEP_LOG_END@json.output@@@"
-    ]
-  },
-  {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/src/tools/swarming_client/swarming.py",
       "--version"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "swarming.py --version",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_TEXT@0.4.10@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
     "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_CHROMIUM_NO_ACTION": "1",
-      "GYP_DEFINES": "clang=1 component=static_library gomadir='[CACHE]/cipd/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1",
+      "GYP_DEFINES": "clang=1 component=static_library gomadir='[BUILD]/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/src/testing/scripts/get_compile_targets.py",
       "--output",
@@ skipping 80 matching lines @@
       "-u",
       "[SLAVE_BUILD]/src/tools/mb/mb.py",
       "gen",
       "-m",
       "chromium.webkit",
       "-b",
       "WebKit Mac Builder",
       "--config-file",
       "[SLAVE_BUILD]/src/tools/mb/mb_config.pyl",
       "--goma-dir",
-      "[CACHE]/cipd/goma",
+      "[BUILD]/goma",
       "--swarming-targets-file",
       "browser_tests\n",
       "//out/Release"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "generate_build_files",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@swarming-targets-file.txt@browser_tests@@@",
       "@@@STEP_LOG_END@swarming-targets-file.txt@@@"
     ]
@@ skipping 37 matching lines @@
       "--goma-cache-dir",
       "[GOMA_CACHE]",
       "--build-tool",
       "ninja",
       "--build-data-dir",
       "[ROOT]/build_data_dir",
       "--compiler",
       "goma-clang",
       "--goma-jsonstatus",
       "/path/to/tmp/json",
-      "--goma-service-account-json-file",
-      "/creds/service_accounts/service-account-goma-client.json",
       "--goma-dir",
-      "[CACHE]/cipd/goma",
+      "[BUILD]/goma",
       "--",
       "blink_tests",
       "browser_tests",
       "browser_tests_run"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "compile",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output (invalid)@null@@@",
       "@@@STEP_LOG_END@json.output (invalid)@@@"
@@ skipping 113 matching lines @@
     "~followup_annotations": [
       "@@@STEP_TEXT@WebKit Mac10.11@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]