The first in a series of mass rebaselines. I tried to avoid

LayoutTests/fast/js/mozilla/strict/15.4.4.12-expected.txt

Index: LayoutTests/fast/js/mozilla/strict/15.4.4.12-expected.txt
diff --git a/LayoutTests/fast/js/mozilla/strict/15.4.4.12-expected.txt b/LayoutTests/fast/js/mozilla/strict/15.4.4.12-expected.txt
index 4da5bc7b6e5f7e9af5957bfaf8272cebf8517b92..853154d686619e6fe9b34887ee924cd569717f68 100644
--- a/LayoutTests/fast/js/mozilla/strict/15.4.4.12-expected.txt
+++ b/LayoutTests/fast/js/mozilla/strict/15.4.4.12-expected.txt
@@ -1,14 +1,14 @@
-PASS 'use strict'; var a = arr(); [a.splice(0, 1), a] threw exception of type TypeError.
-PASS var a = arr(); [a.splice(0, 1), a] threw exception of type TypeError.
+FAIL 'use strict'; var a = arr(); [a.splice(0, 1), a] should throw an instance of TypeError
+FAIL var a = arr(); [a.splice(0, 1), a] should throw an instance of TypeError
 PASS true === true
-PASS 'use strict'; var o = obj(); [Array.prototype.splice.call(o, 0, 1), o] threw exception of type TypeError.
-PASS var o = obj(); [Array.prototype.splice.call(o, 0, 1), o] threw exception of type TypeError.
+FAIL 'use strict'; var o = obj(); [Array.prototype.splice.call(o, 0, 1), o] should throw an instance of TypeError
+FAIL var o = obj(); [Array.prototype.splice.call(o, 0, 1), o] should throw an instance of TypeError
 PASS true === true
-PASS 'use strict'; var a = agap(); [a.splice(0, 1), a] threw exception of type TypeError.
-PASS var a = agap(); [a.splice(0, 1), a] threw exception of type TypeError.
+FAIL 'use strict'; var a = agap(); [a.splice(0, 1), a] should throw an instance of TypeError
+FAIL var a = agap(); [a.splice(0, 1), a] should throw an instance of TypeError
 PASS true === true
-PASS 'use strict'; var o = ogap(); [Array.prototype.splice.call(o, 0, 1), o] threw exception of type TypeError.
-PASS var o = ogap(); [Array.prototype.splice.call(o, 0, 1), o] threw exception of type TypeError.
+FAIL 'use strict'; var o = ogap(); [Array.prototype.splice.call(o, 0, 1), o] should throw an instance of TypeError
+FAIL var o = ogap(); [Array.prototype.splice.call(o, 0, 1), o] should throw an instance of TypeError
 PASS true === true
  PASSED! 
 PASS successfullyParsed is true