Migrate error messages, part 11.

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index eb6e07fb07bdf6df49ead6f9288edf183127dae0..d436b008c2e303693541ecf0aa0acdc277882f14 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -64,13 +64,11 @@ var kMessages = {
   unexpected_strict_reserved:    ["Unexpected strict mode reserved word"],
   unexpected_eos:                ["Unexpected end of input"],
   unexpected_template_string:    ["Unexpected template string"],
-  malformed_regexp:              ["Invalid regular expression: /", "%0", "/: ", "%1"],
   malformed_regexp_flags:        ["Invalid regular expression flags"],
   unterminated_regexp:           ["Invalid regular expression: missing /"],
   unterminated_template:         ["Unterminated template literal"],
   unterminated_template_expr:    ["Missing } in template expression"],
   unterminated_arg_list:         ["missing ) after argument list"],
-  regexp_flags:                  ["Cannot supply flags when constructing one RegExp from another"],
   multiple_defaults_in_switch:   ["More than one default clause in switch statement"],
   newline_after_throw:           ["Illegal newline after throw"],
   label_redeclaration:           ["Label '", "%0", "' has already been declared"],
@@ -82,9 +80,6 @@ var kMessages = {
   non_object_property_store:     ["Cannot set property '", "%0", "' of ", "%1"],
   value_and_accessor:            ["Invalid property.  A property cannot both have accessors and be writable or have a value, ", "%0"],
   proto_object_or_null:          ["Object prototype may only be an Object or null: ", "%0"],
-  invalid_weakmap_key:           ["Invalid value used as weak map key"],
-  invalid_weakset_value:         ["Invalid value used in weak set"],
-  not_a_symbol:                  ["%0", " is not a symbol"],
   // ReferenceError
   invalid_lhs_in_assignment:     ["Invalid left-hand side in assignment"],
   invalid_lhs_in_for:            ["Invalid left-hand side in for-loop"],
@@ -93,8 +88,6 @@ var kMessages = {
   // SyntaxError
   not_isvar:                     ["builtin %IS_VAR: not a variable"],
   single_function_literal:       ["Single function literal required"],
-  invalid_regexp_flags:          ["Invalid flags supplied to RegExp constructor '", "%0", "'"],
-  invalid_regexp:                ["Invalid RegExp pattern /", "%0", "/"],
   illegal_break:                 ["Illegal break statement"],
   illegal_continue:              ["Illegal continue statement"],
   illegal_return:                ["Illegal return statement"],