make buildTree private

src/util/internalCallTree.js

@@ -14,17 +14,13 @@ class InternalCallTree {
     this.sourceLocationTracker = new SourceLocationTracker(codeManager)
     debuggerEvent.register('newTraceLoaded', (trace) => {
       this.reset()
-      this.buildTree(trace)
-      this.event.trigger('callTreeReady', [this.scopes, this.scopeStarts])
-    })
-  }
-
-  buildTree (trace) {
       if (!this.solidityProxy.loaded()) {
         console.log('compilation result not loaded. Cannot build internal call tree')
       } else {
         buildTree(this, 0, '', trace)
       }
+      this.event.trigger('callTreeReady', [this.scopes, this.scopeStarts])
+    })
   }
 
   reset () {