Refactor 4 PPB_Flash functions to the new PPAPI resource model.

ppapi/host/ppapi_host.cc

 // Copyright (c) 2012 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 "ppapi/host/ppapi_host.h"
 
 #include "base/logging.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/host/host_factory.h"
 #include "ppapi/host/host_message_context.h"
@@ skipping 116 matching lines @@
   HostMessageContext context(params, reply_msg);
   HandleResourceCall(params, nested_msg, &context);
 }
 
 void PpapiHost::HandleResourceCall(
     const proxy::ResourceMessageCallParams& params,
     const IPC::Message& nested_msg,
     HostMessageContext* context) {
   ResourceHost* resource_host = GetResourceHost(params.pp_resource());
   if (resource_host) {
+    // CAUTION: Handling the message may cause the destruction of this object.
     resource_host->HandleMessage(nested_msg, context);
   } else {
     if (context->params.has_callback()) {
       ReplyMessageContext reply_context = context->MakeReplyMessageContext();
       reply_context.params.set_result(PP_ERROR_BADRESOURCE);
       SendReply(reply_context, context->reply_msg);
     }
   }
 }
 
@@ skipping 48 matching lines @@
   resources_.erase(found);
 }
 
 ResourceHost* PpapiHost::GetResourceHost(PP_Resource resource) const {
   ResourceMap::const_iterator found = resources_.find(resource);
   return found == resources_.end() ? NULL : found->second.get();
 }
 
 }  // namespace host
 }  // namespace ppapi