Correct net::EmbeddedTestServer usage in google_apis_unittests.

google_apis/drive/base_requests_unittest.cc

Index: google_apis/drive/base_requests_unittest.cc
diff --git a/google_apis/drive/base_requests_unittest.cc b/google_apis/drive/base_requests_unittest.cc
index a6dcbe1ba5331326862ca114965b440da2c8ccac..bce6b71b5faa7b55f3c59798eba644f02b440259 100644
--- a/google_apis/drive/base_requests_unittest.cc
+++ b/google_apis/drive/base_requests_unittest.cc
@@ -120,9 +120,9 @@ class BaseRequestsTest : public testing::Test {
                                     message_loop_.task_runner(),
                                     std::string() /* custom user agent */));
 
-    ASSERT_TRUE(test_server_.Start());
     test_server_.RegisterRequestHandler(
         base::Bind(&BaseRequestsTest::HandleRequest, base::Unretained(this)));
+    ASSERT_TRUE(test_server_.Start());
   }
 
   std::unique_ptr<net::test_server::HttpResponse> HandleRequest(