Fix message routing for BrowserPlugin in iframe

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 5575adb86bfabf8d20175a8b9ed9833e7a5efd6e..40236597e6cd7f60689d0a1dc516e8f9533ef6a5 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -157,6 +157,10 @@
 #include "content/child/npapi/np_channel_base.h"
 #endif
 
+#if defined(ENABLE_EXTENSIONS)
+#include "content/renderer/browser_plugin/browser_plugin_manager.h"
+#endif
+
 #if defined(ENABLE_PLUGINS)
 #include "content/renderer/npapi/plugin_channel_host.h"
 #endif
@@ -472,6 +476,11 @@ void RenderThreadImpl::Init() {
   vc_manager_.reset(new VideoCaptureImplManager());
   AddFilter(vc_manager_->video_capture_message_filter());
 
+#if defined(ENABLE_EXTENSIONS)
+  browser_plugin_manager_.reset(new BrowserPluginManager());
+  AddObserver(browser_plugin_manager_.get());
+#endif
+
 #if defined(ENABLE_WEBRTC)
   peer_connection_tracker_.reset(new PeerConnectionTracker());
   AddObserver(peer_connection_tracker_.get());