can be static.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@11305 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/maven/ProcessCache.java

@@ -108,7 +108,7 @@ public final class ProcessCache {
         }
     }
 
-    class PerChannel {
+    static class PerChannel {
         /**
          * Cached processes.
          */