Fix  warning during JSCompiler build
@@ -260,7 +260,7 @@ class IsolatePolyfills implements CompilerPass {
Node.isStringGetprop(callee)
? IR.string(callee.getString()).useSourceInfoFrom(callee)
: callee.getSecondChild().detach();
- final Node receiver = callee.getFirstChild().detach();
+ final Node receiver = callee.removeFirstChild();
boolean requiresTemp = compiler.getAstAnalyzer().mayEffectMutableState(receiver);
