Added characters that look like padlocks to URL unescaping blacklist.

net/base/escape_unittest.cc

Index: net/base/escape_unittest.cc
diff --git a/net/base/escape_unittest.cc b/net/base/escape_unittest.cc
index 98afb8cfb4373197a515cb8920499e7fe9ff5bd3..8ec90af28e8420f17246fc953e7d21ff208967cd 100644
--- a/net/base/escape_unittest.cc
+++ b/net/base/escape_unittest.cc
@@ -276,6 +276,34 @@ TEST(EscapeTest, UnescapeURLComponent) {
      UnescapeRule::NORMAL | UnescapeRule::CONTROL_CHARS,
      L"Some%20random text %25\xE2\x81\xA9OK"},
 
+    // Certain banned characters should not be unescaped unless explicitly told
+    // to do so with UnescapeRule::CONTROL_CHARS.
+    // U+1F50F LOCK WITH INK PEN
+    {L"Some%20random text %25%F0%9F%94%8FOK", UnescapeRule::NORMAL,
+     L"Some%20random text %25%F0%9F%94%8FOK"},
+    // U+1F510 CLOSED LOCK WITH KEY
+    {L"Some%20random text %25%F0%9F%94%90OK", UnescapeRule::NORMAL,
+     L"Some%20random text %25%F0%9F%94%90OK"},
+    // U+1F512 LOCK
+    {L"Some%20random text %25%F0%9F%94%92OK", UnescapeRule::NORMAL,
+     L"Some%20random text %25%F0%9F%94%92OK"},
+    // U+1F513 OPEN LOCK
+    {L"Some%20random text %25%F0%9F%94%93OK", UnescapeRule::NORMAL,
+     L"Some%20random text %25%F0%9F%94%93OK"},
+    // UnescapeRule::CONTROL_CHARS should unescape banned characters.
+    {L"Some%20random text %25%F0%9F%94%8FOK",
+     UnescapeRule::NORMAL | UnescapeRule::CONTROL_CHARS,
+     L"Some%20random text %25\xF0\x9F\x94\x8FOK"},
+    {L"Some%20random text %25%F0%9F%94%90OK",
+     UnescapeRule::NORMAL | UnescapeRule::CONTROL_CHARS,
+     L"Some%20random text %25\xF0\x9F\x94\x90OK"},
+    {L"Some%20random text %25%F0%9F%94%92OK",
+     UnescapeRule::NORMAL | UnescapeRule::CONTROL_CHARS,
+     L"Some%20random text %25\xF0\x9F\x94\x92OK"},
+    {L"Some%20random text %25%F0%9F%94%93OK",
+     UnescapeRule::NORMAL | UnescapeRule::CONTROL_CHARS,
+     L"Some%20random text %25\xF0\x9F\x94\x93OK"},
+
     {L"Some%20random text %25%2dOK", UnescapeRule::SPACES,
      L"Some random text %25-OK"},
     {L"Some%20random text %25%2dOK", UnescapeRule::URL_SPECIAL_CHARS,