fixing another 1.8.7 bug.

lib/fog/google/compute.rb

@@ -83,7 +83,7 @@ module Fog
             :application_name => "fog",
             :application_version => Fog::VERSION,
           })
-          @client.authorization = Signet::OAuth2::Client.new(
+          @client.authorization = Signet::OAuth2::Client.new({
             :audience => 'https://accounts.google.com/o/oauth2/token',
             :auth_provider_x509_cert_url => "https://www.googleapis.com/oauth2/v1/certs",
             :client_x509_cert_url => "https://www.googleapis.com/robot/v1/metadata/x509/#{google_client_email}",
@@ -91,7 +91,7 @@ module Fog
             :scope => api_scope_url,
             :signing_key => key,
             :token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
-          )
+          })
           @client.authorization.fetch_access_token!
 
           @compute = @client.discovered_api('compute', api_version)