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

chrome/browser/extensions/extension_webrequest_api.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_webrequest_api.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
@@ skipping 1021 matching lines @@
   CHECK_EQ(listeners_[profile][event_name].count(listener), 1u) <<
       "extension=" << extension_id << " event=" << event_name;
 
   // Unblock any request that this event listener may have been blocking.
   for (std::set<uint64>::iterator it = found->blocked_requests.begin();
        it != found->blocked_requests.end(); ++it) {
     DecrementBlockCount(profile, extension_id, event_name, *it, NULL);
   }
 
   listeners_[profile][event_name].erase(listener);
+
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+                          base::Bind(&ClearCacheOnNavigationOnUI));
 }
 
 void ExtensionWebRequestEventRouter::OnOTRProfileCreated(
     void* original_profile, void* otr_profile) {
   cross_profile_map_[original_profile] = otr_profile;
   cross_profile_map_[otr_profile] = original_profile;
 }
 
 void ExtensionWebRequestEventRouter::OnOTRProfileDestroyed(
     void* original_profile, void* otr_profile) {
@@ skipping 435 matching lines @@
            ExtensionAPIPermission::kWebRequestBlocking)) {
     error_ = keys::kBlockingPermissionRequired;
     return false;
   }
 
   ExtensionWebRequestEventRouter::GetInstance()->AddEventListener(
       profile_id(), extension_id(), extension_name,
       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())));
 
   return true;
 }
 
 bool WebRequestEventHandled::RunImpl() {
   std::string event_name;
   EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &event_name));
@@ skipping 155 matching lines @@
       } else if ((*it)->name().find("AdBlock") != std::string::npos) {
         adblock = true;
       } else {
         other = true;
       }
     }
   }
 
   host->Send(new ExtensionMsg_UsingWebRequestAPI(adblock, adblock_plus, other));
 }