[GCM] Remove GCMDriver::Purge and GCMClient::CheckOut

components/gcm_driver/gcm_client_impl_unittest.cc

Index: components/gcm_driver/gcm_client_impl_unittest.cc
diff --git a/components/gcm_driver/gcm_client_impl_unittest.cc b/components/gcm_driver/gcm_client_impl_unittest.cc
index 273c99f783317971ec598140fed1b09cb9702f1c..7ae42b2a7519193dae49d110eb783b3139d9f789 100644
--- a/components/gcm_driver/gcm_client_impl_unittest.cc
+++ b/components/gcm_driver/gcm_client_impl_unittest.cc
@@ -600,14 +600,6 @@ TEST_F(GCMClientImplTest, LoadingCompleted) {
   EXPECT_TRUE(device_checkin_info().account_tokens.empty());
 }
 
-TEST_F(GCMClientImplTest, CheckOut) {
-  EXPECT_TRUE(mcs_client());
-  EXPECT_TRUE(connection_factory());
-  gcm_client()->CheckOut();
-  EXPECT_FALSE(mcs_client());
-  EXPECT_FALSE(connection_factory());
-}
-
 TEST_F(GCMClientImplTest, RegisterApp) {
   EXPECT_FALSE(ExistsRegistration(kAppId));