SF: Clean up layer state

Remove unused layer states.

Bug: 238781169
Test: presubmit
Change-Id: I84917bed157a93ec9bfd16d168312ce27ff1765e
diff --git a/services/surfaceflinger/layerproto/transactions.proto b/services/surfaceflinger/layerproto/transactions.proto
index 49487ee..b687abc 100644
--- a/services/surfaceflinger/layerproto/transactions.proto
+++ b/services/surfaceflinger/layerproto/transactions.proto
@@ -82,7 +82,7 @@
         eChangesLsbNone = 0;
         ePositionChanged = 0x00000001;
         eLayerChanged = 0x00000002;
-        eSizeChanged = 0x00000004;
+        // unused = 0x00000004;
         eAlphaChanged = 0x00000008;
 
         eMatrixChanged = 0x00000010;