use google/auth 0.9 (#970)

Author: bshaffer

composer.json

@@ -7,7 +7,7 @@
     "license": "Apache-2.0",
     "require": {
         "php": ">=5.4",
-        "google/auth": "0.8",
+        "google/auth": "0.9",
         "google/apiclient-services": "*@dev",
         "firebase/php-jwt": "~2.0|~3.0",
         "monolog/monolog": "^1.17",

src/Google/Client.php

@@ -1048,8 +1048,7 @@ private function createApplicationDefaultCredentials()
         'private_key' => $signingKey,
         'type' => 'service_account',
       );
-      $keyStream = Psr7\stream_for(json_encode($serviceAccountCredentials));
-      $credentials = CredentialsLoader::makeCredentials($scopes, $keyStream);
+      $credentials = CredentialsLoader::makeCredentials($scopes, $serviceAccountCredentials);
     } else {
       $credentials = ApplicationDefaultCredentials::getCredentials($scopes);
     }