[Mac] Add a feature flag to disable Javascript execution in Applescript

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index 2b9424b4b74e7b06ab23ba34c4350b6d23234515..da79d9e2fd5736081ee150f311ab2b5baa30c054 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -8,6 +8,12 @@ namespace features {
 
 // All features in alphabetical order.
 
+#if defined(OS_MACOSX)
+// Enables Javascript execution via AppleScript.
+const base::Feature kAppleScriptExecuteJavaScript{
+    "AppleScriptExecuteJavaScript", base::FEATURE_ENABLED_BY_DEFAULT};
+#endif  // defined(OS_MACOSX)
+
 #if defined(OS_CHROMEOS)
 // Whether to handle low memory kill of ARC apps by Chrome.
 const base::Feature kArcMemoryManagement{