Remove "synchronized" from InMemoryNodeEntry.getVersion(). References in Java
are always updated atomically and so this should be thread-safe anyway.

RELNOTES: None.
PiperOrigin-RevId: 209656796
diff --git a/src/main/java/com/google/devtools/build/skyframe/InMemoryNodeEntry.java b/src/main/java/com/google/devtools/build/skyframe/InMemoryNodeEntry.java
index 12e3a23..2a0f664 100644
--- a/src/main/java/com/google/devtools/build/skyframe/InMemoryNodeEntry.java
+++ b/src/main/java/com/google/devtools/build/skyframe/InMemoryNodeEntry.java
@@ -518,7 +518,7 @@
   }
 
   @Override
-  public synchronized Version getVersion() {
+  public Version getVersion() {
     return lastChangedVersion;
   }