Move Declarative Web Request API out of experimental and make it a feature

chrome/browser/extensions/api/web_request/web_request_api.cc

 // Copyright (c) 2012 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/api/web_request/web_request_api.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
@@ skipping 1355 matching lines @@
 }
 
 bool ExtensionWebRequestEventRouter::ProcessDeclarativeRules(
     net::URLRequest* request,
     extensions::RequestStages request_stage) {
   if (!rules_registry_.get())
     return false;
 
   base::Time start = base::Time::Now();
 
+  // TODO(battre): Annotate deltas with extension IDs, so that we can
+  // - Sort deltas by precedence
+  // - Check whether extensions have host permissions.
   std::list<linked_ptr<helpers::EventResponseDelta> > result =
       rules_registry_->CreateDeltas(request, request_stage);
 
   base::TimeDelta elapsed_time = start - base::Time::Now();
   UMA_HISTOGRAM_TIMES("Extensions.DeclarativeWebRequestNetworkDelay",
                       elapsed_time);
 
   if (result.empty())
     return false;
 
@@ skipping 322 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));
 }