Get rid of a lot of () for getters.

lib/compiler/implementation/constant_system.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.
 
 interface Operation {
   final SourceString name;
   bool isUserDefinable();
 }
 
 interface UnaryOperation extends Operation {
   /** Returns [:null:] if it was unable to fold the operation. */
   Constant fold(Constant constant);
 }
 
 interface BinaryOperation extends Operation {
   /** Returns [:null:] if it was unable to fold the operation. */
   Constant fold(Constant left, Constant right);
 }
 
 /**
  * A [ConstantSystem] is responsible for creating constants and folding them.
  */
 interface ConstantSystem {
-  BinaryOperation get add();
-  BinaryOperation get bitAnd();
-  UnaryOperation get bitNot();
-  BinaryOperation get bitOr();
-  BinaryOperation get bitXor();
-  BinaryOperation get booleanAnd();
-  BinaryOperation get booleanOr();
-  BinaryOperation get divide();
-  BinaryOperation get equal();
-  BinaryOperation get greaterEqual();
-  BinaryOperation get greater();
-  BinaryOperation get identity();
-  BinaryOperation get lessEqual();
-  BinaryOperation get less();
-  BinaryOperation get modulo();
-  BinaryOperation get multiply();
-  UnaryOperation get negate();
-  UnaryOperation get not();
-  BinaryOperation get shiftLeft();
-  BinaryOperation get shiftRight();
-  BinaryOperation get subtract();
-  BinaryOperation get truncatingDivide();
+  BinaryOperation get add;
+  BinaryOperation get bitAnd;
+  UnaryOperation get bitNot;
+  BinaryOperation get bitOr;
+  BinaryOperation get bitXor;
+  BinaryOperation get booleanAnd;
+  BinaryOperation get booleanOr;
+  BinaryOperation get divide;
+  BinaryOperation get equal;
+  BinaryOperation get greaterEqual;
+  BinaryOperation get greater;
+  BinaryOperation get identity;
+  BinaryOperation get lessEqual;
+  BinaryOperation get less;
+  BinaryOperation get modulo;
+  BinaryOperation get multiply;
+  UnaryOperation get negate;
+  UnaryOperation get not;
+  BinaryOperation get shiftLeft;
+  BinaryOperation get shiftRight;
+  BinaryOperation get subtract;
+  BinaryOperation get truncatingDivide;
 
   Constant createInt(int i);
   Constant createDouble(double d);
   // We need a diagnostic node to report errors in case the string is malformed.
   Constant createString(DartString string, Node diagnosticNode);
   Constant createBool(bool value);
   Constant createNull();
 
   /** Returns true if the [constant] is an integer at runtime. */
   bool isInt(Constant constant);
   /** Returns true if the [constant] is a double at runtime. */
   bool isDouble(Constant constant);
   /** Returns true if the [constant] is a string at runtime. */
   bool isString(Constant constant);
   /** Returns true if the [constant] is a boolean at runtime. */
   bool isBool(Constant constant);
   /** Returns true if the [constant] is null at runtime. */
   bool isNull(Constant constant);
 }