Protect document.execCommand() from recursive call and DOM mutation events

LayoutTests/fast/parser/nested-fragment-parser-crash-expected.txt

Index: LayoutTests/fast/parser/nested-fragment-parser-crash-expected.txt
diff --git a/LayoutTests/fast/parser/nested-fragment-parser-crash-expected.txt b/LayoutTests/fast/parser/nested-fragment-parser-crash-expected.txt
index 04f27ec3f361fad9d2abc9241dffeffc96472374..9053f13c1bca666da3c8ac81ace54c0d5bc3c18b 100644
--- a/LayoutTests/fast/parser/nested-fragment-parser-crash-expected.txt
+++ b/LayoutTests/fast/parser/nested-fragment-parser-crash-expected.txt
@@ -1,6 +1,25 @@
-CONSOLE ERROR: line 19: Uncaught RangeError: Maximum call stack size exceeded.
-CONSOLE ERROR: line 19: Uncaught RangeError: Maximum call stack size exceeded.
-CONSOLE ERROR: line 19: Uncaught RangeError: Maximum call stack size exceeded.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
+CONSOLE WARNING: We don't execute document.execCommand() this time, because it is called recursively.
 x
 x This test passes if it doesn't crash.
-