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

components/search_provider_logos/logo_common.h

Index: components/search_provider_logos/logo_common.h
diff --git a/components/search_provider_logos/logo_common.h b/components/search_provider_logos/logo_common.h
index 36577e730a71f6f6e8f3215c0ea0efb23d198abf..ce94005f904f81d311d1ce9b4181a1e17202f7d4 100644
--- a/components/search_provider_logos/logo_common.h
+++ b/components/search_provider_logos/logo_common.h
@@ -21,6 +21,7 @@ extern const int64_t kMaxTimeToLiveMS;
 
 struct LogoMetadata {
   LogoMetadata();
+  LogoMetadata(const LogoMetadata& other);
   ~LogoMetadata();
 
   // For use by the client ----------------------------------------------------
@@ -53,6 +54,7 @@ struct LogoMetadata {
 
 struct EncodedLogo {
   EncodedLogo();
+  EncodedLogo(const EncodedLogo& other);
   ~EncodedLogo();
 
   // The jpeg- or png-encoded image.