Change SigninClient::CreateGaiaAuthFetcher return type to unique_ptr

components/signin/core/browser/signin_client.h

Index: components/signin/core/browser/signin_client.h
diff --git a/components/signin/core/browser/signin_client.h b/components/signin/core/browser/signin_client.h
index a4910c154dff2e331fe1d7204334d5a43363ab4b..deefb38de9d42aa5854976ddf92c467b1f13fa60 100644
--- a/components/signin/core/browser/signin_client.h
+++ b/components/signin/core/browser/signin_client.h
@@ -5,6 +5,8 @@
 #ifndef COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_CLIENT_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_CLIENT_H_
 
+#include <memory>
+
 #include "base/callback.h"
 #include "base/callback_list.h"
 #include "base/time/time.h"
@@ -116,9 +118,8 @@ class SigninClient : public KeyedService {
   // Execute |callback| if and when there is a network connection.
   virtual void DelayNetworkCall(const base::Closure& callback) = 0;
 
-  // Creates and returns a new platform-specific GaiaAuthFetcher. It is the
-  // responsability of the caller to delete the returned object.
-  virtual GaiaAuthFetcher* CreateGaiaAuthFetcher(
+  // Creates a new platform-specific GaiaAuthFetcher.
+  virtual std::unique_ptr<GaiaAuthFetcher> CreateGaiaAuthFetcher(
       GaiaAuthConsumer* consumer,
       const std::string& source,
       net::URLRequestContextGetter* getter) = 0;