Return sp on call to createSurfaceInterceptor

This is so that SurfaceInterceptor can implement IBinder::DeathRecipient, since that inherits RefBase.h and must be stored as an sp.

Test: Make sure the device boot when SurfaceInterceptor extends RefBase
Change-Id: I264cd9e0a8517ae5a425b3a493631c7c42220473
diff --git a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
index 89476e9..16bea47 100644
--- a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
+++ b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
@@ -83,8 +83,8 @@
         return nullptr;
     }
 
-    std::unique_ptr<SurfaceInterceptor> createSurfaceInterceptor(SurfaceFlinger* flinger) override {
-        return std::make_unique<android::impl::SurfaceInterceptor>(flinger);
+    sp<SurfaceInterceptor> createSurfaceInterceptor(SurfaceFlinger* flinger) override {
+        return new android::impl::SurfaceInterceptor(flinger);
     }
 
     sp<StartPropertySetThread> createStartPropertySetThread(bool timestampPropertyValue) override {
@@ -422,7 +422,7 @@
         mutableCurrentState().displays.clear();
         mutableDrawingState().displays.clear();
         mutableEventQueue().reset();
-        mutableInterceptor().reset();
+        mutableInterceptor().clear();
         mFlinger->mScheduler.reset();
         mFlinger->mCompositionEngine->setHwComposer(std::unique_ptr<HWComposer>());
         mFlinger->mCompositionEngine->setRenderEngine(