Use module.exports rather than this.exports

R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/687263005

engine/src/flutter/tests/custom-elements/resources/document-register-fuzz.sky

@@ -52,7 +52,7 @@ function register(name, options)
     } catch (e) { console.log(e); }
 }
 
-this.exports = {
+module.exports = {
     setupObjectHooks: setupObjectHooks,
     exerciseDocumentRegister: exerciseDocumentRegister,
     register: register,

engine/src/flutter/tests/modules/resources/intermediate.sky

@@ -1,7 +1,7 @@
 <link rel="import" href="../../resources/dump-as-text.sky" />
 <link rel="import" href="pass.sky" as="banana" />
 <script>
-this.exports = {
+module.exports = {
   message: banana,
 };
 </script>

engine/src/flutter/tests/modules/resources/pass.sky

@@ -1,3 +1,3 @@
 <script>
-this.exports = "PASS: pass.sky succesfully exported this string."
+module.exports = "PASS: pass.sky succesfully exported this string."
 </script>