Allow extensions which can run without NPAPI to run under Windows 8 Metro.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index f5193c9be36bd5ac58eaa2472fc6d0aa5e548bcd..7cd697bdd69edd467abf753798021eab04107a7a 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4867,9 +4867,6 @@ Public Exponent (<ph name="PUBLIC_EXPONENT_NUM_BITS">$3<ex>24</ex></ph> bits):
       <message name="IDS_EXTENSION_INSTALL_NOT_ENABLED" desc="Error displayed during installation of apps or extensions when installation is not enabled.">
         Installation is not enabled.
       </message>
-      <message name="IDS_EXTENSION_INSTALL_PLUGIN_NOT_SUPPORTED" desc="Error displayed during installation of apps or extensions when the include a plugin that is not supported.">
-        Installation failed because NPAPI plugins are not supported in this environment.
-      </message>
       <message name="IDS_EXTENSION_INSTALL_INCORRECT_APP_CONTENT_TYPE" desc="Error displayed during installation of apps when the app is not served with the correct content-type.">
         Apps must be served with content-type "<ph name="CONTENT_TYPE">$1<ex>application/x-chrome-extension</ex></ph>".
       </message>