ToolchainContext directly implements SkylarkValue and SkylarkIndexable.

Change-Id: I355b138e143771fd826ab03951df821ea7d58ac5
PiperOrigin-RevId: 201740564
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 d3c2139..c16e95d 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
@@ -1087,7 +1087,7 @@
     if (getToolchainContext() == null) {
       return null;
     }
-    return getToolchainContext().getExecutionPlatform();
+    return getToolchainContext().executionPlatform();
   }
 
   private void checkAttribute(String attributeName, Mode mode) {