Fix confirm/alert dialogs in iframes (#237)

Author: phoenixeliot

source/package.json

@@ -11,5 +11,5 @@
         "min_height": 500
     },
     "version": "0.0.15-prerelease.2",
-    "chromium-args": "--mixed-context --enable-spell-checking --allow-file-access-from-files --allow-file-access --allow-file-cookies"
-}
+    "chromium-args": "--mixed-context --enable-spell-checking --allow-file-access-from-files --allow-file-access --allow-file-cookies --disable-features='SuppressDifferentOriginSubframeJSDialogs'"
+}