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

google_apis/gaia/gaia_auth_fetcher_unittest.cc

Index: google_apis/gaia/gaia_auth_fetcher_unittest.cc
diff --git a/google_apis/gaia/gaia_auth_fetcher_unittest.cc b/google_apis/gaia/gaia_auth_fetcher_unittest.cc
index 15372ccdc19d0fbb5c2e13fffc38effe18699bd0..7bab642c308d1ca1d0167d2d9d6788f4595aa6d3 100644
--- a/google_apis/gaia/gaia_auth_fetcher_unittest.cc
+++ b/google_apis/gaia/gaia_auth_fetcher_unittest.cc
@@ -156,7 +156,7 @@ class GaiaAuthFetcherTest : 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();
   }