DOMException toString is not correct

LayoutTests/fast/events/message-port-multi-expected.txt

Index: LayoutTests/fast/events/message-port-multi-expected.txt
diff --git a/LayoutTests/fast/events/message-port-multi-expected.txt b/LayoutTests/fast/events/message-port-multi-expected.txt
index f7b5d5a24afd57f5023c7a2b0a5b6947f6db388f..e522833a200288c30a11582e410c68ec8a93b864 100644
--- a/LayoutTests/fast/events/message-port-multi-expected.txt
+++ b/LayoutTests/fast/events/message-port-multi-expected.txt
@@ -3,22 +3,22 @@ This test checks the various use cases around sending multiple ports through Mes
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS channel.port1.postMessage("same port", [channel.port1]) threw exception Error: InvalidStateError: DOM Exception 11.
-PASS channel.port1.postMessage("entangled port", [channel.port2]) threw exception Error: InvalidStateError: DOM Exception 11.
-PASS channel.port1.postMessage("null port", [channel3.port1, null, channel3.port2]) threw exception Error: InvalidStateError: DOM Exception 11.
+PASS channel.port1.postMessage("same port", [channel.port1]) threw exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable..
+PASS channel.port1.postMessage("entangled port", [channel.port2]) threw exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable..
+PASS channel.port1.postMessage("null port", [channel3.port1, null, channel3.port2]) threw exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable..
 PASS channel.port1.postMessage("notAPort", [channel3.port1, {}, channel3.port2]) threw exception TypeError: Type error.
-PASS channel.port1.postMessage("duplicate port", [channel3.port1, channel3.port1]) threw exception Error: InvalidStateError: DOM Exception 11.
+PASS channel.port1.postMessage("duplicate port", [channel3.port1, channel3.port1]) threw exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable..
 PASS channel.port1.postMessage("notAnArray", channel3.port1) threw exception TypeError: Type error.
 PASS channel.port1.postMessage("notASequence", [{length: 3}]) threw exception TypeError: Type error.
-PASS channel.port1.postMessage("largeSequence", largePortArray) threw exception Error: InvalidStateError: DOM Exception 11.
+PASS channel.port1.postMessage("largeSequence", largePortArray) threw exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable..
 PASS event.ports is non-null and zero length when no port sent
 PASS event.ports is non-null and zero length when empty array sent
 PASS event.ports contains two ports when two ports sent
 PASS event.ports contains two ports when two ports re-sent after error
-PASS Sending host object has thrown Error: DataCloneError: DOM Exception 25
-PASS Sending host object has thrown Error: DataCloneError: DOM Exception 25
-PASS Sending Function object has thrown Error: DataCloneError: DOM Exception 25
-PASS Sending Error object has thrown Error: DataCloneError: DOM Exception 25
+PASS Sending host object has thrown DataCloneError: An object could not be cloned.
+PASS Sending host object has thrown DataCloneError: An object could not be cloned.
+PASS Sending Function object has thrown DataCloneError: An object could not be cloned.
+PASS Sending Error object has thrown DataCloneError: An object could not be cloned.
 PASS send-port: transferred one port
 PASS send-port-twice: transferred one port twice
 PASS send-two-ports: transferred two ports