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

chrome/common/extensions/manifest_handlers/linked_app_icons.h

 // Copyright 2015 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_COMMON_EXTENSIONS_MANIFEST_HANDLERS_LINKED_APP_ICONS_H_
 #define CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_LINKED_APP_ICONS_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 10 matching lines @@
 struct LinkedAppIcons : public Extension::ManifestData {
   struct IconInfo {
     IconInfo();
     ~IconInfo();
 
     GURL url;
     int size;
   };
 
   LinkedAppIcons();
+  LinkedAppIcons(const LinkedAppIcons& other);
   ~LinkedAppIcons() override;
 
   static const LinkedAppIcons& GetLinkedAppIcons(const Extension* extension);
 
   std::vector<IconInfo> icons;
 };
 
 // Parses the "app.linked_icons" manifest key.
 class LinkedAppIconsHandler : public ManifestHandler {
  public:
   LinkedAppIconsHandler();
   ~LinkedAppIconsHandler() override;
 
   bool Parse(Extension* extension, base::string16* error) override;
 
  private:
   const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(LinkedAppIconsHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_LINKED_APP_ICONS_H_