Move IdentityProvider usage from GCMDriverDesktop to GCMProfileService

components/gcm_driver/fake_gcm_driver.cc

Index: components/gcm_driver/fake_gcm_driver.cc
diff --git a/components/gcm_driver/fake_gcm_driver.cc b/components/gcm_driver/fake_gcm_driver.cc
index 712360b210b6c928ef6d5a91e098fab9ae52f0f7..083093468a31a9afc13c9ee1514fe4fddde2e56a 100644
--- a/components/gcm_driver/fake_gcm_driver.cc
+++ b/components/gcm_driver/fake_gcm_driver.cc
@@ -22,6 +22,12 @@ void FakeGCMDriver::AddAppHandler(
 void FakeGCMDriver::RemoveAppHandler(const std::string& app_id) {
 }
 
+void FakeGCMDriver::SignIn() {
+}
+
+void FakeGCMDriver::Purge() {
+}
+
 void FakeGCMDriver::Enable() {
 }
 
@@ -48,10 +54,6 @@ void FakeGCMDriver::SetGCMRecording(const GetGCMStatisticsCallback& callback,
                                     bool recording) {
 }
 
-std::string FakeGCMDriver::SignedInUserName() const {
-  return std::string();
-}
-
 GCMClient::Result FakeGCMDriver::EnsureStarted() {
   return GCMClient::SUCCESS;
 }