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

ui/base/ime/chromeos/input_method_descriptor.cc

 // Copyright 2013 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 "ui/base/ime/chromeos/input_method_descriptor.h"
 
 #include <sstream>
 
 #include "base/logging.h"
 #include "base/strings/string_split.h"
@@ skipping 16 matching lines @@
     : id_(id),
       name_(name),
       keyboard_layouts_(keyboard_layouts),
       language_codes_(language_codes),
       indicator_(indicator),
       is_login_keyboard_(is_login_keyboard),
       options_page_url_(options_page_url),
       input_view_url_(input_view_url) {
 }
 
+InputMethodDescriptor::InputMethodDescriptor(
+    const InputMethodDescriptor& other) = default;
+
 std::string InputMethodDescriptor::GetPreferredKeyboardLayout() const {
   // TODO(nona): Investigate better way to guess the preferred layout
   //             http://crbug.com/170601.
   return keyboard_layouts_.empty() ? "us" : keyboard_layouts_[0];
 }
 
 std::string InputMethodDescriptor::GetIndicator() const {
   // If indicator is empty, use the first two character in its preferred
   // keyboard layout or language code.
   if (indicator_.empty()) {
     if (extension_ime_util::IsKeyboardLayoutExtension(id_)) {
       return base::ToUpperASCII(GetPreferredKeyboardLayout().substr(0, 2));
     }
     DCHECK(language_codes_.size() > 0);
     return base::ToUpperASCII(language_codes_[0].substr(0, 2));
   }
   return indicator_;
 }
 
 InputMethodDescriptor::InputMethodDescriptor() {
 }
 
 InputMethodDescriptor::~InputMethodDescriptor() {
 }
 
 }  // namespace input_method
 }  // namespace chromeos