Remove explicit keyword from multi-argument constructors

tools/traceline/traceline/assembler.h

 // Copyright (c) 2009 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.
 
 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ skipping 157 matching lines @@
   explicit Operand(Register reg) {
     Init(reg);
   }
 
   // [disp/r]
   explicit Operand(int disp) {
     Init(disp);
   }
 
   // [base + disp/r]
-  explicit Operand(Register base, int disp) {
+  Operand(Register base, int disp) {
     Init(base, disp);
   }
 
   // [base + index*scale + disp/r]
-  explicit Operand(Register base,
-                   Register index,
-                   ScaleFactor scale,
-                   int disp) {
+  Operand(Register base, Register index, ScaleFactor scale, int disp) {
     Init(base, index, scale, disp);
   }
 
   // [index*scale + disp/r]
-  explicit Operand(Register index,
-                   ScaleFactor scale,
-                   int disp) {
+  Operand(Register index, ScaleFactor scale, int disp) {
     Init(index, scale, disp);
   }
 
   void set_reg(Register reg) {
     ASSERT(len_ > 0);
     buf_[0] = (buf_[0] & ~0x38) | static_cast<char>(reg << 3);
   }
 
   char* data() { return buf_; }
   int length() { return len_; }
@@ skipping 368 matching lines @@
   void xchg(Register r1, const Operand& oper) {
     emit(0x87); emit_operand(r1, oper);
   }
 
  private:
   int pos_;
   char* buf_;
 };
 
 #endif  // TRACELINE_ASSEMBLER_H_