Blob/File constructors/slice method shouldn't throw on invalid types

LayoutTests/fast/files/blob-constructor.html

Index: LayoutTests/fast/files/blob-constructor.html
diff --git a/LayoutTests/fast/files/blob-constructor.html b/LayoutTests/fast/files/blob-constructor.html
index a85627d6ffc8f2cd26a56fc9b78ccc70c1f3abc8..16b012afa61a5a8cf43e6d9863c2cd266846d701 100644
--- a/LayoutTests/fast/files/blob-constructor.html
+++ b/LayoutTests/fast/files/blob-constructor.html
@@ -42,7 +42,6 @@ shouldBeTrue("(new Blob([], {unknownKey:'value'})) instanceof window.Blob");
 shouldThrow("new Blob([], {endings:'illegalValue'})", "'TypeError: Failed to construct \\'Blob\\': The provided value \\'illegalValue\\' is not a valid enum value of type NormalizeLineEndings.'");
 shouldThrow("new Blob([], {endings:throwingObj})", "'Error'");
 shouldThrow("new Blob([], {type:throwingObj})", "'Error'");
-shouldThrow("new Blob([], {type:'hello\u00EE'})", "'SyntaxError: Failed to construct \\'Blob\\': The \\'type\\' property must consist of ASCII characters.'");
 
 // Test that order of property bag evaluation is lexigraphical
 var throwingObj1 = { toString: function() { throw "Error 1"; } };
@@ -51,6 +50,12 @@ shouldThrow("new Blob([], {endings:throwingObj1, type:throwingObj2})", "'Error 1
 shouldThrow("new Blob([], {type:throwingObj2, endings:throwingObj1})", "'Error 1'");
 shouldThrow("new Blob([], {type:throwingObj2, endings:'illegal'})", "'TypeError: Failed to construct \\'Blob\\': The provided value \\'illegal\\' is not a valid enum value of type NormalizeLineEndings.'");
 
+// Test non-ASCII type handling
+shouldBeEqualToString("new Blob([], {type:'hello\u00EE'}).type", "");
+
+// Test lowercasing of type
+shouldBeEqualToString("new Blob([], {type:'123ABCabc'}).type", "123abcabc");
+
 // Test various non-object literals being used as property bags.
 shouldBeTrue("(new Blob([], null)) instanceof window.Blob");
 shouldBeTrue("(new Blob([], undefined)) instanceof window.Blob");