Remove explicit keyword from multi-argument constructors

chrome/browser/extensions/extension_message_service.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_message_service.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/json/json_writer.h"
 #include "base/stl_util.h"
 #include "base/values.h"
@@ skipping 19 matching lines @@
 // Port1 is always even, port2 is always odd.
 #define IS_OPENER_PORT_ID(port_id) (((port_id) & 1) == 0)
 
 // Change even to odd and vice versa, to get the other side of a given channel.
 #define GET_OPPOSITE_PORT_ID(source_port_id) ((source_port_id) ^ 1)
 
 struct ExtensionMessageService::MessagePort {
   IPC::Message::Sender* sender;
   int routing_id;
   explicit MessagePort(IPC::Message::Sender* sender = NULL,
-              int routing_id = MSG_ROUTING_CONTROL)
+                       int routing_id = MSG_ROUTING_CONTROL)
      : sender(sender), routing_id(routing_id) {}
 };
 
 struct ExtensionMessageService::MessageChannel {
   ExtensionMessageService::MessagePort opener;
   ExtensionMessageService::MessagePort receiver;
 };
 
 const char ExtensionMessageService::kDispatchOnConnect[] =
     "Port.dispatchOnConnect";
@@ skipping 305 matching lines @@
 
     if (current->second->opener.sender == sender) {
       CloseChannelImpl(current, GET_CHANNEL_OPENER_ID(current->first),
                        notify_other_port);
     } else if (current->second->receiver.sender == sender) {
       CloseChannelImpl(current, GET_CHANNEL_RECEIVERS_ID(current->first),
                        notify_other_port);
     }
   }
 }