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

chrome/browser/geolocation/chrome_access_token_store.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 "chrome/browser/geolocation/chrome_access_token_store.h"
 
 #include "base/bind.h"
 #include "base/string_piece.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 20 matching lines @@
   if (spec == "https://maps.googleapis.com/maps/api/browserlocation/json")
     return true;
 
   return false;
 }
 
 // Loads access tokens and other necessary data on the UI thread, and
 // calls back to the originator on the originating threaad.
 class TokenLoadingJob : public base::RefCountedThreadSafe<TokenLoadingJob> {
  public:
-  TokenLoadingJob(
+  explicit TokenLoadingJob(
       const AccessTokenStore::LoadAccessTokensCallbackType& callback)
       : callback_(callback),
         system_request_context_(NULL) {
   }
 
   void Run() {
     BrowserThread::PostTaskAndReply(
         BrowserThread::UI,
         FROM_HERE,
         base::Bind(&TokenLoadingJob::PerformWorkOnUIThread, this),
@@ skipping 69 matching lines @@
   access_token_dictionary->SetWithoutPathExpansion(
       server_url.spec(), Value::CreateStringValue(token));
 }
 
 void ChromeAccessTokenStore::SaveAccessToken(const GURL& server_url,
                                              const string16& access_token) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&SetAccessTokenOnUIThread, server_url, access_token));
 }