Enable Activity Logging by default

chrome/renderer/extensions/dom_activity_logger.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_DOM_ACTIVITY_LOGGER_H_
 #define CHROME_RENDERER_EXTENSIONS_DOM_ACTIVITY_LOGGER_H_
 
 #include <string>
 
 #include "base/strings/string_piece.h"
@@ skipping 17 matching lines @@
 
   // Marshalls the arguments into an ExtensionHostMsg_DOMAction_Params
   // and sends it over to the browser (via IPC) for appending it to the
   // extension activity log.
   // (Overrides the log method in WebKit::WebDOMActivityLogger)
   virtual void log(const WebString& api_name,
                    int argc,
                    const v8::Handle<v8::Value> argv[],
                    const WebString& call_type);
 
-  // If extension activity logging is enabled then check (using the
-  // WebKit API) if there is no logger attached to the world corresponding
-  // to world_id, and if so, construct a new logger and attach it.
+  // Check (using the WebKit API) if there is no logger attached to the world
+  // corresponding to world_id, and if so, construct a new logger and attach it.
   // worl_id = 0 indicates the main world.
   static void AttachToWorld(int world_id,
                             const std::string& extension_id,
                             const GURL& url,
                             const string16& title);
 
  private:
   std::string extension_id_;
   GURL url_;
   string16 title_;
 
   DISALLOW_COPY_AND_ASSIGN(DOMActivityLogger);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_DOM_ACTIVITY_LOGGER_H_