[Extensions] Fix bad check in SetActivityHandlers()

chrome/browser/extensions/activity_log/activity_log.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/activity_log/activity_log.h"
 
 #include <stddef.h>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 505 matching lines @@
   activity_monitor::Monitor current_function_monitor =
       activity_monitor::GetApiFunctionMonitor();
   DCHECK(!current_function_monitor ||
          current_function_monitor == &LogApiFunction);
   if (!current_function_monitor)
     activity_monitor::SetApiFunctionMonitor(&LogApiFunction);
 
   activity_monitor::Monitor current_event_monitor =
       activity_monitor::GetApiEventMonitor();
   DCHECK(!current_event_monitor || current_event_monitor == &LogApiEvent);
-  if (!current_function_monitor)
+  if (!current_event_monitor)
     activity_monitor::SetApiEventMonitor(&LogApiEvent);
 
   activity_monitor::WebRequestMonitor current_web_request_monitor =
       activity_monitor::GetWebRequestMonitor();
   DCHECK(!current_web_request_monitor ||
          current_web_request_monitor == &LogWebRequestActivity);
   if (!current_web_request_monitor)
     activity_monitor::SetWebRequestMonitor(&LogWebRequestActivity);
 }
 
@@ skipping 402 matching lines @@
   }
 }
 
 template <>
 void BrowserContextKeyedAPIFactory<ActivityLog>::DeclareFactoryDependencies() {
   DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
   DependsOn(ExtensionRegistryFactory::GetInstance());
 }
 
 }  // namespace extensions