Remove explicit keyword from multi-argument constructors

chrome/browser/history/text_database_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_HISTORY_TEXT_DATABASE_MANAGER_H_
 #define CHROME_BROWSER_HISTORY_TEXT_DATABASE_MANAGER_H_
 #pragma once
 
 #include <set>
 #include <vector>
@@ skipping 56 matching lines @@
   };
 
   // You must call Init() to complete initialization.
   //
   // |dir| is the directory that will hold the full text database files (there
   // will be many files named by their date ranges).
   //
   // The visit database is a pointer owned by the caller for the main database
   // (of recent visits). The visit database will be updated to refer to the
   // added text database entries.
-  explicit TextDatabaseManager(const FilePath& dir,
-                               URLDatabase* url_database,
-                               VisitDatabase* visit_database);
+  TextDatabaseManager(const FilePath& dir,
+                      URLDatabase* url_database,
+                      VisitDatabase* visit_database);
   ~TextDatabaseManager();
 
   // Must call before using other functions. If it returns false, no other
   // functions should be called.
   bool Init(const HistoryPublisher* history_publisher);
 
   // Returns the directory that holds the full text database files.
   const FilePath& GetDir() { return dir_; }
 
   // Allows scoping updates. This also allows things to go faster since every
@@ skipping 213 matching lines @@
   // This can be NULL if there are no indexers registered to receive indexing
   // data from us.
   const HistoryPublisher* history_publisher_;
 
   DISALLOW_COPY_AND_ASSIGN(TextDatabaseManager);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_TEXT_DATABASE_MANAGER_H_