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

google_apis/gaia/gaia_oauth_client_unittest.cc

Index: google_apis/gaia/gaia_oauth_client_unittest.cc
diff --git a/google_apis/gaia/gaia_oauth_client_unittest.cc b/google_apis/gaia/gaia_oauth_client_unittest.cc
index d181df153a9bf4f24b726b47ba73d4421467a4a9..18bda59e297ea9956a37628347d498229dd6b1be 100644
--- a/google_apis/gaia/gaia_oauth_client_unittest.cc
+++ b/google_apis/gaia/gaia_oauth_client_unittest.cc
@@ -188,7 +188,7 @@ class GaiaOAuthClientTest : public testing::Test {
   net::TestURLRequestContextGetter* GetRequestContext() {
     if (!request_context_getter_.get()) {
       request_context_getter_ = new net::TestURLRequestContextGetter(
-          message_loop_.message_loop_proxy());
+          message_loop_.task_runner());
     }
     return request_context_getter_.get();
   }