It looks like the Chrome NPAPI plugin installer has been broken since we firs...

webkit/default_plugin/plugin_impl_win.h

Index: webkit/default_plugin/plugin_impl_win.h
===================================================================
--- webkit/default_plugin/plugin_impl_win.h	(revision 12720)
+++ webkit/default_plugin/plugin_impl_win.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -191,6 +191,41 @@
   // Arabic).
   bool IsRTLLayout() const;
 
+  // Parses the plugin instantiation arguments. This includes checking for
+  // whether this is an activex install and reading the appropriate
+  // arguments like codebase, etc. For plugin installs we download the
+  // plugin finder URL and initalize the mime type and the plugin instance
+  // info.
+  //
+  // Parameters:
+  // module_handle: The handle to the dll in which this object is instantiated.
+  // instance: The plugins opaque instance handle.
+  // mime_type: Identifies the third party plugin
+  // argc: Indicates the count of arguments passed in from the webpage.
+  // argv: Pointer to the arguments.
+  // raw_activex_clsid: Output parameter which contains the CLSID of the
+  //                    Activex plugin needed for an Activex install
+  // is_activex: Output parameter indicating if this is an activex install
+  // activex_clsid: Output parameter containing the classid of the activex
+  //                for an activex install
+  // activex_codebase: Output parameter containing the activex codebase if
+  //                   this is an activex install
+  // plugin_download_url: Output parameter containing the plugin download url
+  //                      on success.
+  // plugin_finder_url: Output parameter containing the plugin finder url on
+  //                    success.
+  // Returns true on success.
+  static bool ParseInstantiationArguments(NPMIMEType mime_type,
+                                          NPP instance,
+                                          int16 argc,
+                                          char* argn[],
+                                          char* argv[],
+                                          std::string* raw_activex_clsid,
+                                          bool* is_activex,
+                                          std::string* activex_clsid,
+                                          std::string* activex_codebase,
+                                          std::string* plugin_download_url,
+                                          std::string* plugin_finder_url);
  protected:
   // Window message handlers.
   LRESULT OnPaint(UINT message, WPARAM wparam, LPARAM lparam, BOOL& handled);
@@ -254,7 +289,7 @@
   // relative_url
   //   The URL to be resolved.
   // Returns the resolved URL.
-  std::string ResolveURL(NPP instance, const std::string& relative_url);
+  static std::string ResolveURL(NPP instance, const std::string& relative_url);
 
   // Initializes resources like the icon, fonts, etc needed by the plugin
   // installer
@@ -265,32 +300,6 @@
   // Returns true on success.
   bool InitializeResources(HINSTANCE module_handle);
 
-  // Parses the plugin instantiation arguments. This includes checking for
-  // whether this is an activex install and reading the appropriate
-  // arguments like codebase, etc. For plugin installs we download the
-  // plugin finder URL and initalize the mime type and the plugin instance
-  // info.
-  //
-  // Parameters:
-  // module_handle
-  //   The handle to the dll in which this object is instantiated.
-  // instance
-  //   The plugins opaque instance handle.
-  // mime_type
-  //   Identifies the third party plugin which would be eventually installed.
-  // argc
-  //   Indicates the count of arguments passed in from the webpage.
-  // argv
-  //   Pointer to the arguments.
-  // raw_activex_clsid
-  //   Output parameter which contains the CLSID of the Activex plugin needed.
-  //   This is only applicable if the webpage specifically requests an ActiveX
-  //   control.
-  // Returns true on success.
-  bool ParseInstantiationArguments(NPMIMEType mime_type, NPP instance,
-                                   int16 argc, char* argn[], char* argv[],
-                                   std::string* raw_activex_clsid);
-
   // Paints user action messages to the plugin window. These include messages
   // like whether the user should click on the plugin window to download the
   // plugin, etc.