Fix incorrect map usage in the WebPluginImpl::didReceiveData function, which ...

webkit/glue/webplugin_impl.cc

 // 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 "config.h"
 
 #include "base/compiler_specific.h"
 #include "build/build_config.h"
 
 MSVC_PUSH_WARNING_LEVEL(0);
@@ skipping 1024 matching lines @@
       }
     }
   }
 }
 
 void WebPluginImpl::didReceiveData(WebCore::ResourceHandle* handle,
                                    const char *buffer,
                                    int length, int) {
   WebPluginResourceClient* client = GetClientFromHandle(handle);
   if (client) {
-    MultipartResponseDelegate* multi_part_handler =
-      multi_part_response_map_[client];
-    if (multi_part_handler) {
+    MultiPartResponseHandlerMap::iterator index =
+        multi_part_response_map_.find(client);
+    if (index != multi_part_response_map_.end()) {
+      MultipartResponseDelegate* multi_part_handler = (*index).second;
+      DCHECK(multi_part_handler != NULL);
       multi_part_handler->OnReceivedData(buffer, length);
     } else {
       client->DidReceiveData(buffer, length, 0);
     }
   }
 }
 
 void WebPluginImpl::didFinishLoading(WebCore::ResourceHandle* handle) {
   WebPluginResourceClient* client = GetClientFromHandle(handle);
   if (client) {
@@ skipping 350 matching lines @@
     client_index = clients_.erase(client_index);
     if (resource_client)
       resource_client->DidFail();
   }
 
   // This needs to be called now and not in the destructor since the
   // webframe_ might not be valid anymore.
   webframe_->set_plugin_delegate(NULL);
   webframe_ = NULL;
 }