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

chrome/common/extensions/api/speech/tts_engine_manifest_handler.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_API_SPEECH_TTS_ENGINE_MANIFEST_HANDLER_H_
 #define CHROME_COMMON_EXTENSIONS_API_SPEECH_TTS_ENGINE_MANIFEST_HANDLER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest_handler.h"
 
 namespace extensions {
 
 struct TtsVoice {
   TtsVoice();
+  TtsVoice(const TtsVoice& other);
   ~TtsVoice();
 
   std::string voice_name;
   std::string lang;
   std::string gender;
   bool remote;
   std::set<std::string> event_types;
 
   static const std::vector<TtsVoice>* GetTtsVoices(const Extension* extension);
 };
 
 // Parses the "tts_engine" manifest key.
 class TtsEngineManifestHandler : public ManifestHandler {
  public:
   TtsEngineManifestHandler();
   ~TtsEngineManifestHandler() override;
 
   bool Parse(Extension* extension, base::string16* error) override;
 
  private:
   const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(TtsEngineManifestHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_API_SPEECH_TTS_ENGINE_MANIFEST_HANDLER_H_