Remove port lifetime management from renderer

chrome/browser/extensions/api/messaging/extension_message_port.h

Index: chrome/browser/extensions/api/messaging/extension_message_port.h
diff --git a/chrome/browser/extensions/api/messaging/extension_message_port.h b/chrome/browser/extensions/api/messaging/extension_message_port.h
index dd6e584fc5ef842cd18a8e4161cb1b2950516c6e..92b785803d2184935a5558c0dfaf4921d6644757 100644
--- a/chrome/browser/extensions/api/messaging/extension_message_port.h
+++ b/chrome/browser/extensions/api/messaging/extension_message_port.h
@@ -41,6 +41,12 @@ class ExtensionMessagePort : public MessageService::MessagePort {
                        content::RenderProcessHost* extension_process);
   ~ExtensionMessagePort() override;
 
+  // Checks whether the frames to which this port is tied at its construction
+  // are still aware of this port's existence. Frames that don't know about
+  // the port are removed from the set of frames. This should be used for opener
+  // ports because the frame may be navigated before the port was initialized.
+  void RevalidatePort();
+
   // MessageService::MessagePort:
   void RemoveCommonFrames(const MessagePort& port) override;
   bool HasFrame(content::RenderFrameHost* rfh) const override;
@@ -92,6 +98,11 @@ class ExtensionMessagePort : public MessageService::MessagePort {
   // when the frame is removed or unloaded.
   std::set<content::RenderFrameHost*> frames_;
 
+  // The ID of the tab where the channel was created. This is saved so that any
+  // onMessage events can be run in the scope of the tab.
+  // Only set on receiver ports (if the opener was a tab). -1 if invalid.
+  int opener_tab_id_;
+
   // Whether the renderer acknowledged creation of the port. This is used to
   // distinguish abnormal port closure (e.g. no receivers) from explicit port
   // closure (e.g. by the port.disconnect() JavaScript method in the renderer).