Prepare Chrome Extensions for ES2015 RegExp semantics

extensions/renderer/safe_builtins.cc

Index: extensions/renderer/safe_builtins.cc
diff --git a/extensions/renderer/safe_builtins.cc b/extensions/renderer/safe_builtins.cc
index fbd88bdb15f3ee1278455b446159ecfcbc0386f7..b3e4f8425c0cebc72c47a8a4dc54e647715f33d8 100644
--- a/extensions/renderer/safe_builtins.cc
+++ b/extensions/renderer/safe_builtins.cc
@@ -79,8 +79,10 @@ const char kScript[] =
     "saveBuiltin(String,\n"
     "            ['indexOf', 'slice', 'split', 'substr', 'toUpperCase',\n"
     "             'replace']);\n"
+    "// Use exec rather than test to defend against clobbering in the\n"
+    "// presence of ES2015 semantics, which read RegExp.prototype.exec.\n"
     "saveBuiltin(RegExp,\n"
-    "            ['test']);\n"
+    "            ['exec']);\n"
     "saveBuiltin(Error,\n"
     "            [],\n"
     "            ['captureStackTrace']);\n"