Fix image_test for new small mode API.

Portable build fix.

Change-Id: I89a9c6f6117ac60105a9540467d281bae3b70bdd
diff --git a/runtime/image_test.cc b/runtime/image_test.cc
index 7f90505..334f7ab 100644
--- a/runtime/image_test.cc
+++ b/runtime/image_test.cc
@@ -49,7 +49,7 @@
 #if defined(ART_USE_PORTABLE_COMPILER)
       // TODO: we disable this for portable so the test executes in a reasonable amount of time.
       //       We shouldn't need to do this.
-      runtime_->SetSmallMode(true);
+      runtime_->SetCompilerFilter(Runtime::kInterpretOnly);
 #endif
       compiler_driver_->CompileAll(class_loader, class_linker->GetBootClassPath(), timings);