Updated to avoid deprecation of encode and decode methods in multi_json gem.

lib/google/api_client/client_secrets.rb

@@ -39,7 +39,7 @@ module Google
             search_path = File.expand_path(File.join(search_path, '..'))
           end
         end
-        data = File.open(filename, 'r') { |file| MultiJson.decode(file.read) }
+        data = File.open(filename, 'r') { |file| MultiJson.load(file.read) }
         return self.new(data)
       end
 
@@ -77,7 +77,7 @@ module Google
       )
 
       def to_json
-        return MultiJson.encode({
+        return MultiJson.dump({
           self.flow => ({
             'client_id' => self.client_id,
             'client_secret' => self.client_secret,

lib/google/api_client/reference.rb

@@ -103,7 +103,7 @@ module Google
       
       def serialize_body(body)
         return body.to_json if body.respond_to?(:to_json)
-        return MultiJson.encode(options[:body_object].to_hash) if body.respond_to?(:to_hash)
+        return MultiJson.dump(options[:body_object].to_hash) if body.respond_to?(:to_hash)
         raise TypeError, 'Could not convert body object to JSON.' +
                          'Must respond to :to_json or :to_hash.'
       end

lib/google/api_client/result.rb

@@ -63,7 +63,7 @@ module Google
           data = self.body
           case media_type
           when 'application/json'
-            data = MultiJson.decode(data)
+            data = MultiJson.load(data)
             # Strip data wrapper, if present
             data = data['data'] if data.has_key?('data')
           else