Move DEFAULT_EXEC_GROUP_NAME from ToolchainCollection to ExecGroup.

PiperOrigin-RevId: 372342837
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java b/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
index 12f82d6..dcd3671 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
@@ -15,7 +15,7 @@
 package com.google.devtools.build.lib.analysis;
 
 import static com.google.common.base.MoreObjects.firstNonNull;
-import static com.google.devtools.build.lib.analysis.ToolchainCollection.DEFAULT_EXEC_GROUP_NAME;
+import static com.google.devtools.build.lib.packages.ExecGroup.DEFAULT_EXEC_GROUP_NAME;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Joiner;