Remove explicit keyword from multi-argument constructors

chrome/browser/extensions/extension_event_router.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_event_router.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_devtools_manager.h"
 #include "chrome/browser/extensions/extension_processes_api.h"
 #include "chrome/browser/extensions/extension_processes_api_constants.h"
@@ skipping 18 matching lines @@
   ExtensionWebRequestEventRouter::GetInstance()->RemoveEventListener(
       profile, extension_id, sub_event_name);
 }
 
 }  // namespace
 
 struct ExtensionEventRouter::EventListener {
   RenderProcessHost* process;
   std::string extension_id;
 
-  explicit EventListener(RenderProcessHost* process,
-                         const std::string& extension_id)
+  EventListener(RenderProcessHost* process, const std::string& extension_id)
       : process(process), extension_id(extension_id) {}
 
   bool operator<(const EventListener& that) const {
     if (process < that.process)
       return true;
     if (process == that.process && extension_id < that.extension_id)
       return true;
     return false;
   }
 };
@@ skipping 191 matching lines @@
           }
         }
       }
       break;
     }
     default:
       NOTREACHED();
       return;
   }
 }