Clear in-memory cache after adding or deleting an event handler to ensure it is effective

chrome/browser/extensions/extension_webrequest_api.cc

Index: chrome/browser/extensions/extension_webrequest_api.cc
diff --git a/chrome/browser/extensions/extension_webrequest_api.cc b/chrome/browser/extensions/extension_webrequest_api.cc
index 3c6bcca149284a3492d74a56065ffcf49aa3e422..f1ee72dad890c4236ec309bd80186f5bd20cc877 100644
--- a/chrome/browser/extensions/extension_webrequest_api.cc
+++ b/chrome/browser/extensions/extension_webrequest_api.cc
@@ -1039,6 +1039,9 @@ void ExtensionWebRequestEventRouter::RemoveEventListener(
   }
 
   listeners_[profile][event_name].erase(listener);
+
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+                          base::Bind(&ClearCacheOnNavigationOnUI));
 }
 
 void ExtensionWebRequestEventRouter::OnOTRProfileCreated(
@@ -1494,6 +1497,9 @@ bool WebRequestAddEventListener::RunImpl() {
       event_name, sub_event_name, filter,
       extra_info_spec, ipc_sender_weak());
 
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+                          base::Bind(&ClearCacheOnNavigationOnUI));
+
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
       &NotifyWebRequestAPIUsed,
       profile_id(), make_scoped_refptr(GetExtension())));