chrome: Add out-of-line copy ctors for complex classes.

chrome/common/extensions/command.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/common/extensions/command.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 276 matching lines @@
                  const std::string& accelerator,
                  bool global)
     : command_name_(command_name),
       description_(description),
       global_(global) {
   base::string16 error;
   accelerator_ = ParseImpl(accelerator, CommandPlatform(), 0,
                            IsNamedCommand(command_name), &error);
 }
 
+Command::Command(const Command& other) = default;
+
 Command::~Command() {}
 
 // static
 std::string Command::CommandPlatform() {
 #if defined(OS_WIN)
   return values::kKeybindingPlatformWin;
 #elif defined(OS_MACOSX)
   return values::kKeybindingPlatformMac;
 #elif defined(OS_CHROMEOS)
   return values::kKeybindingPlatformChromeOs;
@@ skipping 242 matching lines @@
       accelerator_ = accelerator;
       command_name_ = command_name;
       description_ = description;
       global_ = global;
     }
   }
   return true;
 }
 
 }  // namespace extensions