Start using the proxy resolve IPC for plugins....

chrome/common/plugin_messages_internal.h

 // Copyright (c) 2006-2008 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.
 
 #include "base/shared_memory.h"
 #include "chrome/common/ipc_message_macros.h"
 #include "webkit/glue/webcursor.h"
 
 //-----------------------------------------------------------------------------
 // PluginProcess messages
@@ skipping 52 matching lines @@
                               std::vector<uint8> /* opaque data response */)
 
   // Used to get cookies for the given URL.  The request_context is a
   // CPBrowsingContext, but is passed as int32 to avoid compilation errors.
   IPC_SYNC_MESSAGE_CONTROL2_1(PluginProcessHostMsg_GetCookies,
                               int32 /* request_context */,
                               GURL /* url */,
                               std::string /* cookies */)
 
   // Get the list of proxies to use for |url|, as a semicolon delimited list
-  // of "<TYPE> <HOST>:<PORT>" | "DIRECT".
+  // of "<TYPE> <HOST>:<PORT>" | "DIRECT". See also ViewHostMsg_ResolveProxy
+  // which does the same thing.
   IPC_SYNC_MESSAGE_CONTROL1_2(PluginProcessHostMsg_ResolveProxy,
                               GURL /* url */,
                               int /* network error */,
                               std::string /* proxy list */)
 
   // Creates a child window of the given parent window on the UI thread.
   IPC_SYNC_MESSAGE_CONTROL1_1(PluginProcessHostMsg_CreateWindow,
                               HWND /* parent */,
                               HWND /* child */)
 
@@ skipping 231 matching lines @@
                              std::string /* script */,
                              bool /* popups_allowed */,
                              NPVariant_Param /* result_param */,
                              bool /* result */)
 
   IPC_SYNC_MESSAGE_ROUTED1_0(NPObjectMsg_SetException,
                              std::string /* message */)
 
 IPC_END_MESSAGES(NPObject)