PPAPI: More test cleanup

ppapi/tests/test_graphics_3d.cc

Index: ppapi/tests/test_graphics_3d.cc
diff --git a/ppapi/tests/test_graphics_3d.cc b/ppapi/tests/test_graphics_3d.cc
index 987d5a8bae9bcf3151aed2719835fcc48b90ad0f..61bedbf198b2730e67caed19e31fcd3a1b251004 100644
--- a/ppapi/tests/test_graphics_3d.cc
+++ b/ppapi/tests/test_graphics_3d.cc
@@ -137,11 +137,8 @@ std::string TestGraphics3D::TestExtensionsGL() {
 
 int32_t TestGraphics3D::SwapBuffersSync(pp::Graphics3D* context) {
   TestCompletionCallback callback(instance_->pp_instance(), callback_type());
-  int32_t rv = context->SwapBuffers(callback.GetCallback());
-  if (rv != PP_OK_COMPLETIONPENDING)
-    return rv;
-
-  return callback.WaitForResult();
+  callback.WaitForResult(context->SwapBuffers(callback.GetCallback()));
+  return callback.result();
 }
 
 std::string TestGraphics3D::CheckPixelPPAPI(