[Extensions] Remove source/opener tab id from extension ports

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

Index: chrome/browser/extensions/api/messaging/extension_message_port.cc
diff --git a/chrome/browser/extensions/api/messaging/extension_message_port.cc b/chrome/browser/extensions/api/messaging/extension_message_port.cc
index 2e7f595275062100631e5b98fd508baff4370863..caf0f068ed47e1aea9300bdcbc86daa0b8cf9db2 100644
--- a/chrome/browser/extensions/api/messaging/extension_message_port.cc
+++ b/chrome/browser/extensions/api/messaging/extension_message_port.cc
@@ -99,7 +99,6 @@ ExtensionMessagePort::ExtensionMessagePort(
       extension_id_(extension_id),
       browser_context_(extension_process->GetBrowserContext()),
       extension_process_(extension_process),
-      opener_tab_id_(-1),
       did_create_port_(false),
       background_host_ptr_(nullptr),
       frame_tracker_(new FrameTracker(this)) {
@@ -122,7 +121,6 @@ ExtensionMessagePort::ExtensionMessagePort(
       extension_id_(extension_id),
       browser_context_(rfh->GetProcess()->GetBrowserContext()),
       extension_process_(nullptr),
-      opener_tab_id_(-1),
       did_create_port_(false),
       background_host_ptr_(nullptr),
       frame_tracker_(new FrameTracker(this)) {
@@ -203,10 +201,8 @@ void ExtensionMessagePort::DispatchOnConnect(
     const GURL& source_url,
     const std::string& tls_channel_id) {
   ExtensionMsg_TabConnectionInfo source;
-  if (source_tab) {
+  if (source_tab)
     source.tab.Swap(source_tab.get());
-    source.tab.GetInteger("id", &opener_tab_id_);
-  }
   source.frame_id = source_frame_id;
 
   ExtensionMsg_ExternalConnectionInfo info;
@@ -228,7 +224,7 @@ void ExtensionMessagePort::DispatchOnDisconnect(
 
 void ExtensionMessagePort::DispatchOnMessage(const Message& message) {
   SendToPort(base::MakeUnique<ExtensionMsg_DeliverMessage>(
-      MSG_ROUTING_NONE, port_id_, opener_tab_id_, message));
+      MSG_ROUTING_NONE, port_id_, message));
 }
 
 void ExtensionMessagePort::IncrementLazyKeepaliveCount() {