Provide script/gypi support for manifest generation

chrome/browser/resources/chromeos/chromevox/manifest_guest.json

Index: chrome/browser/resources/chromeos/chromevox/manifest_guest.json
diff --git a/chrome/browser/resources/chromeos/chromevox/manifest_guest.json b/chrome/browser/resources/chromeos/chromevox/manifest_guest.json
deleted file mode 100644
index d20b4642a2fbe68cc47ecf011899447f4c867916..0000000000000000000000000000000000000000
--- a/chrome/browser/resources/chromeos/chromevox/manifest_guest.json
+++ /dev/null
@@ -1,43 +0,0 @@
-{
-  // NOTE: Keep two json files in this directory in sync. The only difference
-  // should be incognito:split in Guest mode version.
-  "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDltVl1k15pjRzuZfMc3B69inxwm2bZeZ2O8/zFO+NluHnBm3GJ3fzdOoFGJd+M16I8p7zxxQyHeDMfWYASyCeB8XnUEDKjqNLQfCnncsANzHsYoEbYj2nEUML2P13b9q+AAvpCBpAJ4cZp81e9n1y/vbSXHE4385cgkKueItzikQIDAQAB",
-  "manifest_version": 2,
-  "name": "ChromeVox",
-  "version": "1.0",
-  "description": "ChromeVox - Giving Voice to Chrome.",
-  "incognito": "split",
-  "background": {
-    "page": "chromevox/background/background.html"
-  },
-  "permissions": [
-    "accessibilityPrivate",
-    "automation",
-    "bookmarks",
-    "tabs",
-    "experimental",
-    "history",
-    "tts",
-    "systemPrivate",
-    "brailleDisplayPrivate",
-    "commandLinePrivate",
-    "<all_urls>"
-  ],
-  "content_scripts": [
-    {
-      "matches": [ "<all_urls>" ],
-      "exclude_globs": [ "chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromevox/background/background.html" ],
-      "all_frames": true,
-      "js": [
-        "chromeVoxChromePageScript.js"
-      ]
-    }
-  ],
-  "web_accessible_resources": [
-    "chromevox/injected/api.js",
-    "chromevox/injected/api_util.js",
-    "chromevox/injected/mathjax.js",
-    "chromevox/injected/mathjax_external_util.js"
-  ],
-  "default_locale": "en"
-}