DOMException toString is not correct

LayoutTests/http/tests/media/media-source/webkitmediasource-add-and-remove-buffers-expected.txt

Index: LayoutTests/http/tests/media/media-source/webkitmediasource-add-and-remove-buffers-expected.txt
diff --git a/LayoutTests/http/tests/media/media-source/webkitmediasource-add-and-remove-buffers-expected.txt b/LayoutTests/http/tests/media/media-source/webkitmediasource-add-and-remove-buffers-expected.txt
index 77ea313806c2647c6182210e11ec74e1bb61924c..31df252dbbacf48d3ca2ddaf44a264f0c2e17327 100644
--- a/LayoutTests/http/tests/media/media-source/webkitmediasource-add-and-remove-buffers-expected.txt
+++ b/LayoutTests/http/tests/media/media-source/webkitmediasource-add-and-remove-buffers-expected.txt
@@ -1,29 +1,29 @@
 Tests webkitSourceAddId() & webkitSourceRemoveId() methods
 
 Test adding an ID while closed.
-Got expected exception Error: InvalidStateError: DOM Exception 11
+Got expected exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable.
 
 running testAddBufferFailureCases
 EVENT(webkitsourceopen)
 Test empty type.
-Got expected exception Error: InvalidAccessError: DOM Exception 15
+Got expected exception InvalidAccessError: A parameter or an operation was not supported by the underlying object.
 Test an unsupported type.
-Got expected exception Error: NotSupportedError: DOM Exception 9
+Got expected exception NotSupportedError: The implementation did not support the requested type of object or operation.
 Test a supported type with an unsupported codec.
-Got expected exception Error: NotSupportedError: DOM Exception 9
+Got expected exception NotSupportedError: The implementation did not support the requested type of object or operation.
 Test reaching sourceID limit.
 Test that SourceBuffers can't be added while in the ended state.
-Got expected exception Error: InvalidStateError: DOM Exception 11
+Got expected exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable.
 
 running testRemoveNullBuffer
 EVENT(webkitsourceopen)
 Test null buffer case
-Got expected exception Error: InvalidAccessError: DOM Exception 15
+Got expected exception InvalidAccessError: A parameter or an operation was not supported by the underlying object.
 
 running testRemoveAgain
 EVENT(webkitsourceopen)
 Test removing a buffer that was already removed.
-Got expected exception Error: InvalidStateError: DOM Exception 11
+Got expected exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable.
 
 running testRemoveBufferAfterEnded
 EVENT(webkitsourceopen)
@@ -37,8 +37,8 @@ running testAppendFailureCases
 EVENT(webkitsourceopen)
 Test a successful append.
 Test append with a null buffer.
-Got expected exception Error: InvalidAccessError: DOM Exception 15
+Got expected exception InvalidAccessError: A parameter or an operation was not supported by the underlying object.
 Test append after buffer has been removed.
-Got expected exception Error: InvalidStateError: DOM Exception 11
+Got expected exception InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable.
 END OF TEST