Apply error-prone fixes for MethodCanBeStatic in Skfyrame.

PiperOrigin-RevId: 305711825
diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/FilesystemValueCheckerTest.java b/src/test/java/com/google/devtools/build/lib/skyframe/FilesystemValueCheckerTest.java
index 5ea78f8..93efbec 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/FilesystemValueCheckerTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/FilesystemValueCheckerTest.java
@@ -848,7 +848,7 @@
   // TODO(bazel-team): Add some tests for FileSystemValueChecker#changedKeys*() methods.
   // Presently these appear to be untested.
 
-  private ActionExecutionValue actionValue(Action action) {
+  private static ActionExecutionValue actionValue(Action action) {
     Map<Artifact, FileArtifactValue> artifactData = new HashMap<>();
     for (Artifact output : action.getOutputs()) {
       try {
@@ -874,7 +874,7 @@
         /*actionDependsOnBuildId=*/ false);
   }
 
-  private ActionExecutionValue actionValueWithEmptyDirectory(Artifact emptyDir) {
+  private static ActionExecutionValue actionValueWithEmptyDirectory(Artifact emptyDir) {
     TreeArtifactValue emptyValue = TreeArtifactValue.create
         (ImmutableMap.<TreeFileArtifact, FileArtifactValue>of());
 
@@ -886,7 +886,8 @@
         /*actionDependsOnBuildId=*/ false);
   }
 
-  private ActionExecutionValue actionValueWithTreeArtifacts(List<TreeFileArtifact> contents) {
+  private static ActionExecutionValue actionValueWithTreeArtifacts(
+      List<TreeFileArtifact> contents) {
     Map<Artifact, FileArtifactValue> fileData = new HashMap<>();
     Map<Artifact, Map<TreeFileArtifact, FileArtifactValue>> directoryData = new HashMap<>();
 
@@ -928,7 +929,7 @@
         /*actionDependsOnBuildId=*/ false);
   }
 
-  private ActionExecutionValue actionValueWithRemoteTreeArtifact(
+  private static ActionExecutionValue actionValueWithRemoteTreeArtifact(
       SpecialArtifact output, Map<PathFragment, RemoteFileArtifactValue> children) {
     ImmutableMap.Builder<TreeFileArtifact, FileArtifactValue> childFileValues =
         ImmutableMap.builder();
@@ -947,7 +948,7 @@
         /* actionDependsOnBuildId= */ false);
   }
 
-  private ActionExecutionValue actionValueWithRemoteArtifact(
+  private static ActionExecutionValue actionValueWithRemoteArtifact(
       Artifact output, RemoteFileArtifactValue value) {
     return ActionExecutionValue.create(
         Collections.singletonMap(output, value),