Remove the support of multiple shadow roots with a user agent shadow root

third_party/WebKit/LayoutTests/fast/dom/shadow/shadow-disable-expected.txt

Index: third_party/WebKit/LayoutTests/fast/dom/shadow/shadow-disable-expected.txt
diff --git a/third_party/WebKit/LayoutTests/fast/dom/shadow/shadow-disable-expected.txt b/third_party/WebKit/LayoutTests/fast/dom/shadow/shadow-disable-expected.txt
index 62ecfef86ca7b6e058f5196e9be9e2a75edc10fb..1449ad880bbca3bf967e5645bdea1aabd80439d1 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/shadow/shadow-disable-expected.txt
+++ b/third_party/WebKit/LayoutTests/fast/dom/shadow/shadow-disable-expected.txt
@@ -1,5 +1,4 @@
 CONSOLE WARNING: The <keygen> element is deprecated and will be removed in M54, around October 2016. See https://www.chromestatus.com/features/5716060992962560 for more details.
-CONSOLE WARNING: Calling Element.createShadowRoot() for an element which already hosts a user-agent shadow root is deprecated. See https://www.chromestatus.com/features/4668884095336448 for more details.
 Tests to ensure that shadow element cannot be created in elements having dynamically created shadow root.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
@@ -13,44 +12,44 @@ A
 PASS element.createShadowRoot() is not null
 SECTION
 PASS element.createShadowRoot() is not null
-INPUT
-PASS element.createShadowRoot() is not null
-APPLET
-PASS element.createShadowRoot() is not null
-EMBED
-PASS element.createShadowRoot() is not null
-OBJECT
-PASS element.createShadowRoot() is not null
 g
 PASS element.createShadowRoot() is not null
 rect
 PASS element.createShadowRoot() is not null
 svg
 PASS element.createShadowRoot() is not null
+INPUT
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
+APPLET
+FAIL element.createShadowRoot() should throw an exception. Was [object ShadowRoot].

[tkent, 2016/03/02 06:52:20]

Failing.   It's ok to remove a test for APPLET because we removed it.

[hayato, 2016/03/02 07:04:50]

Done.

+EMBED
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
+OBJECT
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 AUDIO
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 VIDEO
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 SELECT
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 IMG
 PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
 TEXTAREA
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 IFRAME
 PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
 CANVAS
 PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
 METER
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 PROGRESS
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 KEYGEN
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 VIDEO
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 AUDIO
-PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
+PASS element.createShadowRoot() threw exception InvalidStateError: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts an user-agent shadow tree..
 FIELDSET
 PASS element.createShadowRoot() threw exception HierarchyRequestError: Failed to execute 'createShadowRoot' on 'Element': Author-created shadow roots are disabled for this element..
 PASS successfullyParsed is true