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

chrome/renderer/plugins/power_saver_info.cc

Index: chrome/renderer/plugins/power_saver_info.cc
diff --git a/chrome/renderer/plugins/power_saver_info.cc b/chrome/renderer/plugins/power_saver_info.cc
index 199b66ae191773d28d69e32659f75d57e08348f5..c54ed8ca5881bb8c6e997e8d2c3091f5f6ac084d 100644
--- a/chrome/renderer/plugins/power_saver_info.cc
+++ b/chrome/renderer/plugins/power_saver_info.cc
@@ -73,6 +73,8 @@ std::string GetPluginInstancePosterAttribute(
 PowerSaverInfo::PowerSaverInfo()
     : power_saver_enabled(false), blocked_for_background_tab(false) {}
 
+PowerSaverInfo::PowerSaverInfo(const PowerSaverInfo& other) = default;
+
 PowerSaverInfo PowerSaverInfo::Get(content::RenderFrame* render_frame,
                                    bool power_saver_setting_on,
                                    const blink::WebPluginParams& params,