google_apis: Migrate callers of message_loop_proxy() to task_runner()

google_apis/gcm/engine/gcm_store_impl_unittest.cc

Index: google_apis/gcm/engine/gcm_store_impl_unittest.cc
diff --git a/google_apis/gcm/engine/gcm_store_impl_unittest.cc b/google_apis/gcm/engine/gcm_store_impl_unittest.cc
index 2b0c4018f39c0f7f0d2731bd785645b87abac818..442f898f1d89303bc01ef7426d444784ba39a585 100644
--- a/google_apis/gcm/engine/gcm_store_impl_unittest.cc
+++ b/google_apis/gcm/engine/gcm_store_impl_unittest.cc
@@ -83,7 +83,7 @@ scoped_ptr<GCMStoreImpl> GCMStoreImplTest::BuildGCMStore() {
       // behavior in the production code. Currently GCMStoreImpl checks if
       // the directory exist or not to determine the store existence.
       temp_directory_.path().Append(FILE_PATH_LITERAL("GCM Store")),
-      message_loop_.message_loop_proxy(),
+      message_loop_.task_runner(),
       make_scoped_ptr<Encryptor>(new FakeEncryptor)));
 }