WindowBase64::atob() does not remove space characters from input

LayoutTests/fast/dom/Window/atob-btoa.html

Index: LayoutTests/fast/dom/Window/atob-btoa.html
diff --git a/LayoutTests/fast/dom/Window/atob-btoa.html b/LayoutTests/fast/dom/Window/atob-btoa.html
index ecf752d5b2ef3b13a733cdd8b34c5da1c39a17c3..fdb549b9e7ff029ed9225bd84e2b1af02847caba 100644
--- a/LayoutTests/fast/dom/Window/atob-btoa.html
+++ b/LayoutTests/fast/dom/Window/atob-btoa.html
@@ -11,6 +11,7 @@ shouldBe('window.atob("YWJj")', '"abc"');
 shouldBe('window.atob("YWJjZA==")', '"abcd"');
 shouldBe('window.atob("YWJjZGU=")', '"abcde"');
 shouldBe('window.atob("YWJjZGVm")', '"abcdef"');
+
 shouldBe('window.btoa("a")', '"YQ=="');
 shouldBe('window.btoa("ab")', '"YWI="');
 shouldBe('window.btoa("abc")', '"YWJj"');
@@ -36,8 +37,19 @@ shouldThrow('window.atob()', '"TypeError: Failed to execute \'atob\' on \'Window
 shouldBe('window.atob("")', '""');
 shouldBe('window.atob(null)', '"\x9Eée"'); // Gets converted to "null" string.
 shouldThrow('window.atob(undefined)');
-shouldThrow('window.atob(" YQ==")');
-shouldThrow('window.atob("YQ==\\u000a")');
+
+// HTML space characters in input.
+shouldBe('window.atob(" YQ==")', '"a"');
+shouldBe('window.atob("YQ== ")', '"a"');
+shouldBe('window.atob("YQ==    ")', '"a"');
+shouldBe('window.atob("YQ==\\u000a")', '"a"');
+shouldBe('window.atob("YQ ==")', '"a"');
+shouldBe('window.atob("YQ\\t==")', '"a"');
+shouldBe('window.atob("YQ\\n==")', '"a"');
+shouldBe('window.atob("YQ\\f==")', '"a"');
+shouldBe('window.atob("YQ\\r==")', '"a"');
+shouldBe('window.atob("YQ\\t\\n\\f\\r ==")', '"a"');
+
 shouldBe('window.atob("6ek=")', '"éé"');
 shouldBe('window.atob("6ek")', '"éé"');
 shouldBe('window.atob("gIE=")', '"\u0080\u0081"');