Remove JavaSystem from java_core.

pkg/analyzer/lib/src/generated/java_core.dart

Index: pkg/analyzer/lib/src/generated/java_core.dart
diff --git a/pkg/analyzer/lib/src/generated/java_core.dart b/pkg/analyzer/lib/src/generated/java_core.dart
index 59e904e50c15ee15d3e9daacad7d71f9ba940c71..074bb3ce675bf8faec50da7a7a8ddef1bc20028a 100644
--- a/pkg/analyzer/lib/src/generated/java_core.dart
+++ b/pkg/analyzer/lib/src/generated/java_core.dart
@@ -4,8 +4,6 @@
 
 library analyzer.src.generated.java_core;
 
-final Stopwatch nanoTimeStopwatch = new Stopwatch();
-
 /**
  * Inserts the given arguments into [pattern].
  *
@@ -202,19 +200,6 @@ class JavaString {
   }
 }
 
-class JavaSystem {
-  static int currentTimeMillis() {
-    return (new DateTime.now()).millisecondsSinceEpoch;
-  }
-
-  static int nanoTime() {
-    if (!nanoTimeStopwatch.isRunning) {
-      nanoTimeStopwatch.start();
-    }
-    return nanoTimeStopwatch.elapsedMicroseconds * 1000;
-  }
-}
-
 class PrintStringWriter extends PrintWriter {
   final StringBuffer _sb = new StringBuffer();