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

chrome/common/importer/importer_data_types.cc

Index: chrome/common/importer/importer_data_types.cc
diff --git a/chrome/common/importer/importer_data_types.cc b/chrome/common/importer/importer_data_types.cc
index e2a4ab17b535515261a5e761af6d1a1fcca292fc..7a02114c8a5a65137fdd6a4ceeb9cd6f49232d52 100644
--- a/chrome/common/importer/importer_data_types.cc
+++ b/chrome/common/importer/importer_data_types.cc
@@ -12,6 +12,8 @@ SourceProfile::SourceProfile()
       services_supported(0) {
 }
 
+SourceProfile::SourceProfile(const SourceProfile& other) = default;
+
 SourceProfile::~SourceProfile() {
 }