Enabled reporting problems in some libraries.

compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java

Index: compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
diff --git a/compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java b/compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
index e7fcd7e0121165f91292c78831ad05684479eb8e..e1790bf76d69ee56db249d91ed9a599397df3d32 100644
--- a/compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
+++ b/compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
@@ -2626,11 +2626,6 @@ public class TypeAnalyzer implements DartCompilationPhase {
             operatorMethodName = "operator -binary";
           }
           Member member = itype.lookupMember(operatorMethodName);
-          // TODO(scheglov) remove after library migration from "operator negate()" to "operator -()"
-          if (member == null && operator == Token.SUB) {
-            operatorMethodName = "operator negate";
-            member = itype.lookupMember(operatorMethodName);
-          }
           if (member == null) {
             HasSourceInfo errorTarget = getOperatorHasSourceInfo(node);
             return typeError(errorTarget, TypeErrorCode.CANNOT_BE_RESOLVED,
@@ -3419,10 +3414,6 @@ public class TypeAnalyzer implements DartCompilationPhase {
             return false;
           }
         }
-        // TODO(scheglov) remove after http://code.google.com/p/dart/issues/detail?id=6306
-        if (Elements.isLibrarySource(errorTarget.getSourceInfo().getSource(), "/io/io_runtime.dart")) {
-          return true;
-        }
         // "method" should have at least same number of optional positional parameters as "superMethod"
         {
           LinkedHashMap<VariableElement, DartExpression> defMethod = getParametersDefaultsOptional(parameters);