Take 2 at implementing activeTab.

chrome/common/extensions/extension_messages.cc

Index: chrome/common/extensions/extension_messages.cc
diff --git a/chrome/common/extensions/extension_messages.cc b/chrome/common/extensions/extension_messages.cc
index db167d1c431d6d83ca3ef7a40b58d9efe9581e0d..837088ca24ef4e83469f6cd73b5bb2e1d725615d 100644
--- a/chrome/common/extensions/extension_messages.cc
+++ b/chrome/common/extensions/extension_messages.cc
@@ -27,6 +27,7 @@ ExtensionMsg_Loaded_Params::ExtensionMsg_Loaded_Params(
       scriptable_hosts(extension->GetActivePermissions()->scriptable_hosts()),
       id(extension->id()),
       creation_flags(extension->creation_flags()) {
+  extension->GetAllTabSpecificHostPermissions(&tab_specific_host_permissions);
 }
 
 scoped_refptr<Extension>
@@ -43,6 +44,8 @@ scoped_refptr<Extension>
 
   extension->SetActivePermissions(
         new ExtensionPermissionSet(apis, explicit_hosts, scriptable_hosts));
+  extension->SetAllTabSpecificHostPermissions(tab_specific_host_permissions);
+
   return extension;
 }