Remove explicit keyword from multi-argument constructors

chrome/browser/history/text_database_manager.h

Index: chrome/browser/history/text_database_manager.h
diff --git a/chrome/browser/history/text_database_manager.h b/chrome/browser/history/text_database_manager.h
index 0bf541f6d1cc18fc32e0d50845d2cfb9bc207e01..120f4b1f70eafea2f0ffabf956a60e9f77067f8d 100644
--- a/chrome/browser/history/text_database_manager.h
+++ b/chrome/browser/history/text_database_manager.h
@@ -74,9 +74,9 @@ class TextDatabaseManager {
   // 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