chromium_tests: apply chromium.get_env() when running tests

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_webrtc_fyi_Mac_Tester.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_webrtc_fyi_Mac_Tester.json b/scripts/slave/recipes/chromium.expected/full_chromium_webrtc_fyi_Mac_Tester.json
index 485a8f789a7b5f013130f93f8cda336802934dec..9727c2722c462a62b7d28575f9f54274cd971acb 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_webrtc_fyi_Mac_Tester.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_webrtc_fyi_Mac_Tester.json
@@ -309,6 +309,9 @@
       "--test-launcher-print-test-stdio=always",
       "--test-launcher-bot-mode"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "content_browsertests"
   },
   {
@@ -342,6 +345,9 @@
       "--test-launcher-bot-mode",
       "--test-launcher-print-test-stdio=always"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "browser_tests"
   },
   {
@@ -366,6 +372,9 @@
       "--build-number=571",
       "content_unittests"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "content_unittests"
   },
   {
@@ -395,6 +404,9 @@
       "--test-launcher-jobs=1",
       "--test-launcher-print-test-stdio=always"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "media_unittests"
   },
   {
@@ -420,6 +432,9 @@
       "remoting_unittests",
       "--gtest_filter=Webrtc*"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "remoting_unittests"
   },
   {