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

chrome/common/web_application_info.cc

Index: chrome/common/web_application_info.cc
diff --git a/chrome/common/web_application_info.cc b/chrome/common/web_application_info.cc
index 6cca5db5b065bf51c98a219284ac7e5b8e73d5cc..4a67945a76a334b3ceec95a3a9b7f1cf20bb9e80 100644
--- a/chrome/common/web_application_info.cc
+++ b/chrome/common/web_application_info.cc
@@ -16,5 +16,8 @@ WebApplicationInfo::WebApplicationInfo()
       open_as_window(false) {
 }
 
+WebApplicationInfo::WebApplicationInfo(const WebApplicationInfo& other) =
+    default;
+
 WebApplicationInfo::~WebApplicationInfo() {
 }