Remove Chromecast extension support from cast system tray menu.

chrome/test/data/extensions/tray_cast/manifest.json

Index: chrome/test/data/extensions/tray_cast/manifest.json
diff --git a/chrome/test/data/extensions/tray_cast/manifest.json b/chrome/test/data/extensions/tray_cast/manifest.json
deleted file mode 100644
index 078d2dac537e8924ec38e8e89b708c3b1a9583e7..0000000000000000000000000000000000000000
--- a/chrome/test/data/extensions/tray_cast/manifest.json
+++ /dev/null
@@ -1,14 +0,0 @@
-// chrome-extension://hlgmmjhlnlapooncikdpiiokdjcdpjme/
-{
-  "description": "Exposes a mock API for the tray cast",
-  "name": "Fake Cast Extension",
-  "background": {
-    "scripts": ["background.js"]
-  },
-  "permissions": [
-    "cast"
-  ],
-  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwjUQp4bsqVWjak86Ha5eFFl2c5h9lgqvx7K6Bv30zJTdGw4REIvi5FcS/atdlfP/GzOGufPPKEIH2536KvQP/6o4e0jyK7kT5XUoO8K/CRy+hbu5Xyq61AT3kYEEvN6fgtuu41RDJl20AcBcmBRbeJTKhJcFYJKrZHK73KC53O9uP+fLbsMp7eHwYjirZ1kYUSWlcI+piD4eVSGGcbt0bG8ZSTuOOcFASSiKuWNU7NS/Zl1/esV04XbcS2C9Fsp8HI5FvJWSWEsNRvrWxQn+wvg8YfUKzHUiBr8WVGVUHM7KSO7m3rMl3JM6Be31DMhXMAsc41RRvNjAZpK+DLuP2wIDAQAB",
-  "manifest_version": 2,
-  "version": "0.1"
-}