Rename namespace-sandbox/-runner to linux-sandbox.

--
MOS_MIGRATED_REVID=127538990
diff --git a/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java b/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
index b240a65..8db1105 100644
--- a/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
+++ b/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
@@ -33,7 +33,7 @@
   public static final ImmutableList<String> EMBEDDED_TOOLS = ImmutableList.of(
       "build_interface_so",
       "build-runfiles",
-      "namespace-sandbox",
+      "linux-sandbox",
       "process-wrapper",
       "xcode-locator");