Backed out changeset ce9d71b0a088 (bug 1342348) for crashing in xpcshell test parser/xml/test/unit/test_sanitizer.js. r=backout

dom/base/nsTreeSanitizer.cpp

@@ -1281,10 +1281,6 @@ nsTreeSanitizer::SanitizeURL(mozilla::dom::Element* aElement,
   static const char* kWhitespace = "\n\r\t\b";
   const nsAString& v =
     nsContentUtils::TrimCharsInSet(kWhitespace, value);
-  // Fragment-only url cannot be harmful.
-  if (v.First() == u'#') {
-    return false;
-  }
 
   nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
   uint32_t flags = nsIScriptSecurityManager::DISALLOW_INHERIT_PRINCIPAL;