{Request, Response}.blob() should release its lock when resolved.

LayoutTests/http/tests/fetch/script-tests/response.js

Index: LayoutTests/http/tests/fetch/script-tests/response.js
diff --git a/LayoutTests/http/tests/fetch/script-tests/response.js b/LayoutTests/http/tests/fetch/script-tests/response.js
index 46dde766908b3a85a8c2428812c88695792c76b0..f1263939dd692b8b14f70dad3784c168ed18bc6a 100644
--- a/LayoutTests/http/tests/fetch/script-tests/response.js
+++ b/LayoutTests/http/tests/fetch/script-tests/response.js
@@ -308,10 +308,16 @@ promise_test(function(t) {
   }, 'MIME type for Blob');
 
 promise_test(function(t) {
-    var res = new Response(new Blob([''], {type: 'Text/Plain'}));
+    var res = new Response(new Blob(['hello'], {type: 'Text/Plain'}));
     return res.blob()
       .then(function(blob) {
           assert_equals(blob.type, 'text/plain');
+          assert_equals(blob.size, 5);
+          assert_equals(res.headers.get('Content-Type'), 'text/plain');
+          return res.blob();
+        }).then(function(blob) {

[hiroshige, 2015/04/21 07:17:13]

Please add a comment that states what we are testing here.

[yhirano, 2015/04/22 02:35:30]

Done.

+          assert_equals(blob.type, 'text/plain');
+          assert_equals(blob.size, 0);
           assert_equals(res.headers.get('Content-Type'), 'text/plain');
         });
   }, 'MIME type for Blob with non-empty type');