Replace sets with vectors when storing file handlers.

chrome/browser/resources/file_manager/manifest_new_ui.json

 {
   // chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/
   "key": "MIGdMA0GCSqGSIb3DQEBAQUAA4GLADCBhwKBgQDlhpGghtnNJ7pluQN0RDwbUxwwi99oM35ZEaFYvxPLrf0fIEC18cfDdJi6u4aJ+UoSpgzK731L0P/k4LvK2Rz9kVKOy0+IvuRrWkT7lbrLfA1UEBh02OA1AAshjmyRg4IxCqgl8ia8XWq6HKegS1y1KXZYGgb4qp7Bh9VC4cIzswIBIw==",
   "manifest_version": 2,
   "name": "Files",
   "version": "3.0",
   "description": "File Manager",
   "incognito" : "split",
   "icons": {
     "16": "images/icon16.png",
@@ skipping 14 matching lines @@
     "chrome://resources/",
     "chrome://theme/",
     "tabs",
     "clipboardWrite",
     "clipboardRead",
     "https://docs.google.com/",
     "https://*.googleusercontent.com/",
     "https://drive.google.com/"
   ],
   "file_browser_handlers": [
-    // Automatically opens a volume and later close Files.app when unmounted.
-    // TODO(mtomasz): Implement a better filtering than using file_filters.
-    {
-      "id": "auto-open",
-      "default_title": "__MSG_OPEN_ACTION__",
-      "default_icon": "images/filetype_generic.png",
-      "file_filters": [
-        "filesystem:*"
-      ]
-    },
-    // Selects the passed file after launching Files.app.
-    {
-      "id": "select",
-      "default_title": "__MSG_OPEN_ACTION__",
-      "default_icon": "images/filetype_generic.png",
-      "file_filters": [
-        "filesystem:*"
-      ]
-    },
-    // Opens the passed directory after launching Files.app.
-    // TODO(mtomasz): Implement a directories filtering instead of files.
-    {
-      "id": "open",
-      "default_title": "__MSG_OPEN_ACTION__",
-      "default_icon": "images/filetype_generic.png",
-      "file_filters": [
-        "filesystem:*"
-      ]
-    },
     {
       "id": "play",
       "default_title": "__MSG_PLAY_MEDIA__",
       "default_icon": "images/filetype_audio.png",
       "file_filters": [
         "filesystem:*.amr",
         "filesystem:*.flac",
         "filesystem:*.m4a",
         "filesystem:*.mp3",
         "filesystem:*.oga",
@@ skipping 127 matching lines @@
         "filesystem:*.gsheet"
       ]
     },
     {
       "id": "open-hosted-gslides",
       "default_title": "__MSG_HOSTED__",
       "default_icon": "images/filetype_generic.png",
       "file_filters": [
         "filesystem:*.gslides"
       ]
+    },
+    // The following handlers are used only internally, therefore they do not
+    // have any file filter.
+    // Automatically opens a volume and later close Files.app when unmounted.
+    {
+      "id": "auto-open",
+      "default_title": "__MSG_OPEN_ACTION__",
+      "default_icon": "images/filetype_generic.png",
+      "file_filters": []
+    },
+    // Selects the passed file after launching Files.app.
+    {
+      "id": "select",
+      "default_title": "__MSG_OPEN_ACTION__",
+      "default_icon": "images/filetype_generic.png",
+      "file_filters": []
+    },
+    // Opens the passed directory after launching Files.app.
+    {
+      "id": "open",
+      "default_title": "__MSG_OPEN_ACTION__",
+      "default_icon": "images/filetype_generic.png",
+      "file_filters": []
     }
   ],
   "chrome_url_overrides": {
     "files": "main_new_ui.html"
   },
   // Required to import scripts in a web worker. Note, that in Apps v2, it is
   // enough that anything is passed to web_accessible_resources. If there is
   // at least any file, then all files are allowed. http://crbug.com/179127.
   "web_accessible_resources": ["js/metadata/byte_reader.js"],
   "app": {
     "background": {
       "scripts": [
         "js/file_copy_manager.js",
         "js/async_util.js",
         "js/path_util.js",
         "js/util.js",
         "js/test_util.js",
         "js/background.js"]
     },
     // chrome-extension://pmfjbimdmchhbnneeidfognadeopoehp is the image loader extension.
     "content_security_policy": "default-src 'none'; script-src 'self' chrome://resources chrome-extension://pmfjbimdmchhbnneeidfognadeopoehp; style-src 'self' 'unsafe-inline' chrome://resources; frame-src 'self' about:; img-src 'self' chrome://resources chrome://theme data: https://docs.google.com https://*.googleusercontent.com chrome://extension-icon; media-src 'self' https://*.googleusercontent.com; connect-src https://drive.google.com"
   }
 }