Remove implementation of Panels on OSes other than ChromeOS.

chrome/test/data/panels/context_menu2/manifest.json

Index: chrome/test/data/panels/context_menu2/manifest.json
diff --git a/chrome/test/data/panels/context_menu2/manifest.json b/chrome/test/data/panels/context_menu2/manifest.json
deleted file mode 100644
index 95b00f6632d5bb87a4b1815d9a2110d67dd10db7..0000000000000000000000000000000000000000
--- a/chrome/test/data/panels/context_menu2/manifest.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "name": "Extension that creates a custom context menu item.",
-  "version": "1",
-  "manifest_version": 2,
-  "description": "Used to verify panels only see custom context menu items from their own extension.",
-  "background": {
-    "scripts": ["test.js"]
-  },
-  "permissions": ["contextMenus", "tabs"]
-}