Make OAuth2TokenService and subclasses take delegate by unique_ptr

google_apis/gaia/oauth2_token_service.cc

Index: google_apis/gaia/oauth2_token_service.cc
diff --git a/google_apis/gaia/oauth2_token_service.cc b/google_apis/gaia/oauth2_token_service.cc
index 01614d83f8a83916c0eb7eb3c71a386764bca820..9979a516b002cade9c7382e0d8a0a265708925bc 100644
--- a/google_apis/gaia/oauth2_token_service.cc
+++ b/google_apis/gaia/oauth2_token_service.cc
@@ -388,8 +388,9 @@ OAuth2TokenService::Consumer::Consumer(const std::string& id)
 OAuth2TokenService::Consumer::~Consumer() {
 }
 
-OAuth2TokenService::OAuth2TokenService(OAuth2TokenServiceDelegate* delegate)
-    : delegate_(delegate) {
+OAuth2TokenService::OAuth2TokenService(
+    std::unique_ptr<OAuth2TokenServiceDelegate> delegate)
+    : delegate_(std::move(delegate)) {
   DCHECK(delegate_);
 }
 
@@ -402,6 +403,10 @@ OAuth2TokenServiceDelegate* OAuth2TokenService::GetDelegate() {
   return delegate_.get();
 }
 
+const OAuth2TokenServiceDelegate* OAuth2TokenService::GetDelegate() const {
+  return delegate_.get();
+}
+
 void OAuth2TokenService::AddObserver(Observer* observer) {
   delegate_->AddObserver(observer);
 }