Move ActionInputPrefetcher to the actions package

The plan is to add it to ActionExecutionContext, which is also there.

PiperOrigin-RevId: 162656835
diff --git a/src/test/java/com/google/devtools/build/lib/standalone/StandaloneSpawnStrategyTest.java b/src/test/java/com/google/devtools/build/lib/standalone/StandaloneSpawnStrategyTest.java
index e54152f..0b40e50 100644
--- a/src/test/java/com/google/devtools/build/lib/standalone/StandaloneSpawnStrategyTest.java
+++ b/src/test/java/com/google/devtools/build/lib/standalone/StandaloneSpawnStrategyTest.java
@@ -23,6 +23,7 @@
 import com.google.common.eventbus.EventBus;
 import com.google.devtools.build.lib.actions.ActionContext;
 import com.google.devtools.build.lib.actions.ActionExecutionContext;
+import com.google.devtools.build.lib.actions.ActionInputPrefetcher;
 import com.google.devtools.build.lib.actions.Artifact;
 import com.google.devtools.build.lib.actions.Artifact.ArtifactExpander;
 import com.google.devtools.build.lib.actions.BaseSpawn;
@@ -36,7 +37,6 @@
 import com.google.devtools.build.lib.events.PrintingEventHandler;
 import com.google.devtools.build.lib.events.Reporter;
 import com.google.devtools.build.lib.exec.ActionContextProvider;
-import com.google.devtools.build.lib.exec.ActionInputPrefetcher;
 import com.google.devtools.build.lib.exec.BlazeExecutor;
 import com.google.devtools.build.lib.exec.ExecutionOptions;
 import com.google.devtools.build.lib.exec.SingleBuildFileCache;