Revert of Add the chrome.fileSystem.onVolumeListChanged event.

chrome/test/data/extensions/api_test/file_system/on_volume_list_changed/manifest.json

Index: chrome/test/data/extensions/api_test/file_system/on_volume_list_changed/manifest.json
diff --git a/chrome/test/data/extensions/api_test/file_system/on_volume_list_changed/manifest.json b/chrome/test/data/extensions/api_test/file_system/on_volume_list_changed/manifest.json
deleted file mode 100644
index 63c7f80650c1ee1f26e11e2d9426273b7f286f04..0000000000000000000000000000000000000000
--- a/chrome/test/data/extensions/api_test/file_system/on_volume_list_changed/manifest.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  // chrome-extension://pkplfbidichfdicaijlchgnapepdginl
-  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtDfX9dHNh948bt00YhZBm3P6E5QLaOt+v8kXVtibQfiPtOD2FTScB/f0wX/EQWVO7BkaSOsRkTPcPIgocyMPYr2FLgqGLFlYT9nQpKJZUFNF5oJ5rG6Nv7ppf4zEB3j6da1IBRTz2yOZ+6O1TMZxol/V62/QcqrJeggsHTEPGLdr9Ua4b1Ka0xKJnJngZljsbw93FI1o+P9dAh5BS6wTPiZI/vmJVjvMTkSTnaZ3n9Go2t7A0XLcSxLcVyuLAd2mAvSN0mIviOukdM66wr7llif71nKuUt+4qvlr/r9HfwzN6pA4jkwhtS1UD+3CmB+wsHwsnohNcuu4FIQ6rgq/7QIDAQAB",
-  "name": "chrome.fileSystem.onVolumeListChanged test",
-  "version": "0.1",
-  "description": "Test for notifying about volume list changes.",
-  "app": {
-    "background": {
-      "scripts": ["background.js"]
-    }
-  },
-  "kiosk_only": true,
-  "kiosk_enabled": true,
-  "permissions": [
-    {
-      "fileSystem": ["requestFileSystem"]
-    }
-  ]
-}