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

components/omnibox/browser/shortcuts_database.cc

Index: components/omnibox/browser/shortcuts_database.cc
diff --git a/components/omnibox/browser/shortcuts_database.cc b/components/omnibox/browser/shortcuts_database.cc
index 6981c73d5be4dc62ad81e4520eb589fdfbb4a125..7ba8ea800dda54bcc5ca0ada4b976ca1333fb75f 100644
--- a/components/omnibox/browser/shortcuts_database.cc
+++ b/components/omnibox/browser/shortcuts_database.cc
@@ -80,6 +80,9 @@ ShortcutsDatabase::Shortcut::MatchCore::MatchCore(
       keyword(keyword) {
 }
 
+ShortcutsDatabase::Shortcut::MatchCore::MatchCore(const MatchCore& other) =
+    default;
+
 ShortcutsDatabase::Shortcut::MatchCore::~MatchCore() {
 }
 
@@ -105,6 +108,8 @@ ShortcutsDatabase::Shortcut::Shortcut()
       number_of_hits(0) {
 }
 
+ShortcutsDatabase::Shortcut::Shortcut(const Shortcut& other) = default;
+
 ShortcutsDatabase::Shortcut::~Shortcut() {
 }