Have SourceBuffer throw TypeError for non-finite doubles.

LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html

Index: LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html
diff --git a/LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html b/LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html
index 289fb7c93297ba1e1c7e717e61c5f9223a5fe476..60f1bb7911318143f4d98c5503ef6f58c809f8d7 100644
--- a/LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html
+++ b/LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html
@@ -32,15 +32,15 @@
               assert_true(sourceBuffer != null, "New SourceBuffer returned");
               sourceBuffer.appendWindowEnd = 500.0;
 
-              assert_throws("TypeMismatchError",
+              assert_throws({name: "TypeError"},

[acolwell GONE FROM CHROMIUM, 2014/03/26 16:41:36]

nit: Why can't we just use "TypeError"? It seems odd we have to treat this error
special.

[sof, 2014/03/26 16:43:37]

It'd be nice, but testharness.js only handles DOM exceptions via a string
argument to assert_throws().

                   function() { sourceBuffer.appendWindowStart = Number.NEGATIVE_INFINITY; },
                   "set appendWindowStart throws an exception for Number.NEGATIVE_INFINITY.");
 
-              assert_throws("TypeMismatchError",
+              assert_throws({name: "TypeError"},
                   function() { sourceBuffer.appendWindowStart = Number.POSITIVE_INFINITY; },
                   "set appendWindowStart throws an exception for Number.POSITIVE_INFINITY.");
 
-              assert_throws("TypeMismatchError",
+              assert_throws({name: "TypeError"},
                   function() { sourceBuffer.appendWindowStart = Number.NaN; },
                   "set appendWindowStart throws an exception for Number.NaN.");
 
@@ -101,7 +101,7 @@
 
               sourceBuffer.abort();
               assert_equals(sourceBuffer.appendWindowStart, 0, "appendWindowStart is 0 after an abort'");
-              assert_equals(sourceBuffer.appendWindowEnd, Number.POSITIVE_INFINITY, 
+              assert_equals(sourceBuffer.appendWindowEnd, Number.POSITIVE_INFINITY,
                             "appendWindowStart is POSITIVE_INFINITY after an abort");
               test.waitForExpectedEvents(function()
               {