Prepare to add more initiator info to CachedResource(Request)

LayoutTests/fast/loader/resource-request-callbacks-expected.txt

Index: LayoutTests/fast/loader/resource-request-callbacks-expected.txt
diff --git a/LayoutTests/fast/loader/resource-request-callbacks-expected.txt b/LayoutTests/fast/loader/resource-request-callbacks-expected.txt
index 5e45fb4be5040c58c0bc584bc501e3270d0f219c..cc92d33989d2b52d5fe8a6595093639ddcaea89a 100644
--- a/LayoutTests/fast/loader/resource-request-callbacks-expected.txt
+++ b/LayoutTests/fast/loader/resource-request-callbacks-expected.txt
@@ -1,16 +1,16 @@
 main frame - css requested 'gw432047.ttf'
 main frame - css requested 'greenbox-hotspot35-4.cur'
 main frame - css requested 'lenna.png'
-main frame - element with id 'img-normal' requested 'dice.png'
-main frame - element with id 'img-changing' requested 'dice.png'
-main frame - element with id 'img-not-there' requested 'not-existing.png'
-main frame - element with no id requested 'js-test-post.js'
-main frame - element with id 'img-changing' requested 'mu.png'
-main frame - element with id 'img-created' requested 'oval.png'
-main frame - element with id 'img-created-2' requested 'png_per_row_alpha.png'
-main frame - element with id 'script-created' requested 'empty-script.js'
+main frame - img requested 'dice.png'
+main frame - img requested 'dice.png'
+main frame - img requested 'not-existing.png'
+main frame - script requested 'js-test-post.js'
+main frame - img requested 'mu.png'
+main frame - img requested 'oval.png'
+main frame - img requested 'png_per_row_alpha.png'
+main frame - script requested 'empty-script.js'
 main frame - css requested 'palatted-color-png-gamma-one-color-profile.png'
-This test checks that the correct callbacks for resource requests are invoked. It passes if you see the callbacks for eight resources.
+This test checks that the correct callbacks for resource requests are invoked. It passes if you see the callbacks for 12 resources.