Add missing (and remove superfluous) 'explicit' from constructors.

remoting/host/service_client.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 "remoting/host/service_client.h"
 
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "googleurl/src/gurl.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace {
 const char kServiceUrl[] =
     "https://www.googleapis.com/chromoting/v1/@me/hosts/";
 }  // namespace
 
 namespace remoting {
 
 class ServiceClient::Core
     : public base::RefCountedThreadSafe<ServiceClient::Core>,
       public net::URLFetcherDelegate {
  public:
-  Core(net::URLRequestContextGetter* request_context_getter)
+ explicit Core(net::URLRequestContextGetter* request_context_getter)
            : request_context_getter_(request_context_getter),
              delegate_(NULL),
              pending_request_type_(PENDING_REQUEST_NONE) {
   }
 
   void RegisterHost(const std::string& host_id,
                     const std::string& host_name,
                     const std::string& public_key,
                     const std::string& oauth_access_token,
                     ServiceClient::Delegate* delegate);
@@ skipping 120 matching lines @@
 }
 
 void ServiceClient::UnregisterHost(
     const std::string& host_id,
     const std::string& oauth_access_token,
     Delegate* delegate) {
   return core_->UnregisterHost(host_id, oauth_access_token, delegate);
 }
 
 }  // namespace gaia