remove instrumentated task cycle detection

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisContextImpl.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisContextImpl.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisContextImpl.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisContextImpl.java
index c51cc1934b11e21adcd4aba7c01646e3450085f4..9cd62c8014e1007f997533d121d48f0d3a98c0ca 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisContextImpl.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisContextImpl.java
@@ -109,7 +109,6 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
-import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -932,18 +931,6 @@ public class AnalysisContextImpl implements InternalAnalysisContext {
   private HashMap<Source, ChangeNoticeImpl> pendingNotices = new HashMap<Source, ChangeNoticeImpl>();
 
   /**
-   * A set containing information about the tasks that have been performed since the last change
-   * notification. Used to detect infinite loops in {@link #performAnalysisTask()}.
-   */
-  private LinkedHashSet<String> recentTasks = new LinkedHashSet<String>();
-
-  /**
-   * A flag indicating whether we have already reported an infinite loop in
-   * {@link #performAnalysisTask()}.
-   */
-  private boolean reportedLoop = false;
-
-  /**
    * The object used to synchronize access to all of the caches. The rules related to the use of
    * this lock object are
    * <ul>
@@ -1029,8 +1016,6 @@ public class AnalysisContextImpl implements InternalAnalysisContext {
       return;
     }
     synchronized (cacheLock) {
-      recentTasks.clear();
-      reportedLoop = false;
       //
       // First, compute the list of sources that have been removed.
       //
@@ -1923,18 +1908,6 @@ public class AnalysisContextImpl implements InternalAnalysisContext {
       return new AnalysisResult(getChangeNotices(true), getEnd - getStart, null, -1L);
     }
     String taskDescription = task.toString();
-//    if (!reportedLoop && !recentTasks.add(taskDescription)) {
-//      reportedLoop = true;
-//      @SuppressWarnings("resource")
-//      PrintStringWriter writer = new PrintStringWriter();
-//      writer.print("Performing repeated task: ");
-//      writer.println(taskDescription);
-//      for (String description : recentTasks) {
-//        writer.print("  ");
-//        writer.println(description);
-//      }
-//      logInformation(writer.toString());
-//    }
     notifyAboutToPerformTask(taskDescription);
     if (TRACE_PERFORM_TASK) {
       System.out.println(taskDescription);
@@ -2124,8 +2097,6 @@ public class AnalysisContextImpl implements InternalAnalysisContext {
   public void setChangedContents(Source source, String contents, int offset, int oldLength,
       int newLength) {
     synchronized (cacheLock) {
-      recentTasks.clear();
-      reportedLoop = false;
       String originalContents = contentCache.setContents(source, contents);
       if (contents != null) {
         if (!contents.equals(originalContents)) {
@@ -2159,8 +2130,6 @@ public class AnalysisContextImpl implements InternalAnalysisContext {
   @Override
   public void setContents(Source source, String contents) {
     synchronized (cacheLock) {
-      recentTasks.clear();
-      reportedLoop = false;
       String originalContents = contentCache.setContents(source, contents);
       if (contents != null) {
         if (!contents.equals(originalContents)) {
@@ -4222,8 +4191,6 @@ public class AnalysisContextImpl implements InternalAnalysisContext {
       }
     }
     removeFromPartsUsingMap(oldPartMap);
-    recentTasks.clear();
-    reportedLoop = false;
   }
 
   /**