Remove more warnings.

lib/compiler/implementation/compile_time_constants.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class Constant implements Hashable {
   const Constant();
 
   bool isNull() => false;
   bool isBool() => false;
   bool isTrue() => false;
@@ skipping 35 matching lines @@
     return other.element === element;
   }
 
   String toString() => element.toString();
   List<Constant> getDependencies() => const <Constant>[];
   DartString toDartString() {
     return new DartString.literal(element.name.slowToString());
   }
 
   void _writeJsCode(CodeBuffer buffer, ConstantHandler handler) {
-    compiler.internalError(
+    handler.compiler.internalError(
         "A constant function does not need specific JS code");
   }
 
   void _writeCanonicalizedJsCode(CodeBuffer buffer, ConstantHandler handler) {
     buffer.add(handler.compiler.namer.isolatePropertiesAccess(element));
   }
 
   int hashCode() => element.hashCode();
 }
 
@@ skipping 799 matching lines @@
       accumulator = new DartString.concat(accumulator, partString.value);
     };
     return new StringConstant(accumulator, node);
   }
 
   // TODO(floitsch): provide better error-messages.
   Constant visitSend(Send send) {
     Element element = elements[send];
     if (Elements.isStaticOrTopLevelField(element)) {
       if (element.modifiers === null ||
-          // TODO(johnniwinther): This should eventually be [isConst].  
+          // TODO(johnniwinther): This should eventually be [isConst].
           !element.modifiers.isFinalOrConst()) {
         error(send);
       }
       return compiler.compileVariable(element);
     } else if (Elements.isStaticOrTopLevelFunction(element)
                && send.isPropertyAccess) {
       compiler.codegenWorld.staticFunctionsNeedingGetter.add(element);
       Constant constant = new FunctionConstant(element);
       compiler.constantHandler.registerCompileTimeConstant(constant);
       return constant;
@@ skipping 323 matching lines @@
       Constant fieldValue = fieldValues[field];
       if (fieldValue === null) {
         // Use the default value.
         fieldValue = compiler.compileVariable(field);
       }
       jsNewArguments.add(fieldValue);
     });
     return jsNewArguments;
   }
 }