Move LayerHistoryV2 to LayerHistory

The old class LayerHistory (content detection v1) no longer exists
so LayerHisotryV2 can take its place.

Bug: 174120566
Test: presubmit
Change-Id: I84f33255b04ab082bbc5ae6e3ae4d7a793bfcd14
diff --git a/services/surfaceflinger/tests/unittests/TestableScheduler.h b/services/surfaceflinger/tests/unittests/TestableScheduler.h
index 0bfd999..2192977 100644
--- a/services/surfaceflinger/tests/unittests/TestableScheduler.h
+++ b/services/surfaceflinger/tests/unittests/TestableScheduler.h
@@ -57,13 +57,11 @@
 
     bool hasLayerHistory() const { return static_cast<bool>(mLayerHistory); }
 
-    auto* mutableLayerHistoryV2() {
-        return static_cast<scheduler::impl::LayerHistoryV2*>(mLayerHistory.get());
-    }
+    auto* mutableLayerHistory() { return mLayerHistory.get(); }
 
     size_t layerHistorySize() NO_THREAD_SAFETY_ANALYSIS {
         if (!mLayerHistory) return 0;
-        return mutableLayerHistoryV2()->mLayerInfos.size();
+        return mutableLayerHistory()->mLayerInfos.size();
     }
 
     void replaceTouchTimer(int64_t millis) {