Remove old missing browser page.

Change-Id: I5197029b2e58cbf0530c9e1c14adb11248392177
diff --git a/MissingBrowserPlugin.html b/MissingBrowserPlugin.html
deleted file mode 100644
index 1ae3dba..0000000
--- a/MissingBrowserPlugin.html
+++ /dev/null
@@ -1,11 +0,0 @@
-<html>
-<head>
-<title>Missing GWT Browser Plugin</title>
-</head>
-<body>
-<h1>No GWT Browser Plugin Detected</h1>
-GWT Development Mode needs a browser plugin to operate.  Please <a
-  href="http://gwt-dev-plugin-missing.appspot.com/">install</a> the
-appropriate one for your browser.
-</body>
-</html>