Remove an unused method variable.

RELNOTES: None.
PiperOrigin-RevId: 199115199
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeActionExecutor.java b/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeActionExecutor.java
index 4f10f68..b87e00c 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeActionExecutor.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeActionExecutor.java
@@ -633,7 +633,6 @@
       Environment env,
       @Nullable ActionFileSystem actionFileSystem)
       throws ActionExecutionException, InterruptedException {
-    ActionInputFileCache cache;
     ActionExecutionContext actionExecutionContext =
         ActionExecutionContext.forInputDiscovery(
             executorEngine,