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

chrome/common/web_application_info.cc

 // Copyright (c) 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 "chrome/common/web_application_info.h"
 
 WebApplicationInfo::IconInfo::IconInfo() : width(0), height(0) {
 }
 
 WebApplicationInfo::IconInfo::~IconInfo() {
 }
 
 WebApplicationInfo::WebApplicationInfo()
     : mobile_capable(MOBILE_CAPABLE_UNSPECIFIED),
       generated_icon_color(SK_ColorTRANSPARENT),
       open_as_window(false) {
 }
 
+WebApplicationInfo::WebApplicationInfo(const WebApplicationInfo& other) =
+    default;
+
 WebApplicationInfo::~WebApplicationInfo() {
 }