Make recipes use the new way of enabling goma.

scripts/slave/recipes/chromium_trybot.expected/mac_release_git.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "config",
       "--spec",
       "cache_dir = None\nsolutions = [{'custom_deps': {'src/third_party/WebKit/LayoutTests': None, 'src/webkit/data/layout_tests/LayoutTests': None}, 'custom_vars': {'googlecode_url': 'svn://svn-mirror.golo.chromium.org/%s', 'nacl_trunk': 'svn://svn-mirror.golo.chromium.org/native_client/trunk', 'sourceforge_url': 'svn://svn-mirror.golo.chromium.org/%(repo)s', 'webkit_trunk': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'safesync_url': 'https://build.chromium.org/p/chromium/lkcr-status/lkgr', 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]"
     ],
@@ skipping 83 matching lines @@
     "name": "apply_issue"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
     "env": {
-      "GYP_DEFINES": "clang=1 component=static_library dcheck_always_on=1 fastbuild=1 target_arch=ia32",
+      "GYP_DEFINES": "clang=1 component=static_library dcheck_always_on=1 fastbuild=1 gomadir=[BUILD]/goma target_arch=ia32 use_goma=1",
       "GYP_GENERATORS": "ninja"
     },
     "name": "gclient runhooks"
   },
   {
     "abort_on_failure": false,
     "can_fail_build": false,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/compile.py",
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma-clang",
+      "--goma-dir",
+      "[BUILD]/goma",
       "--",
       "base_unittests",
       "cacheinvalidation_unittests",
       "cc_unittests",
       "chromedriver_unittests",
       "components_unittests",
       "content_unittests",
       "crypto_unittests",
       "google_apis_unittests",
       "gpu_unittests",
@@ skipping 883 matching lines @@
       "-u",
       "print \"ALL IS WELL\""
     ],
     "name": "nacl_integration",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@print \"ALL IS WELL\"@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   }
 ]