Remove some (but not all) unused methods in analyzer.

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

Index: pkg/analyzer/lib/src/generated/constant.dart
diff --git a/pkg/analyzer/lib/src/generated/constant.dart b/pkg/analyzer/lib/src/generated/constant.dart
index a361edefe00f2c4ed3203be58e024e3d5945e48b..e94ade9491c1437f881cb5ff046357876bec7265 100644
--- a/pkg/analyzer/lib/src/generated/constant.dart
+++ b/pkg/analyzer/lib/src/generated/constant.dart
@@ -1474,24 +1474,6 @@ class ConstantVisitor extends UnifyingAstVisitor<DartObjectImpl> {
     _error(node, null);
     return null;
   }
-
-  /**
-   * Return `true` if the given element represents the 'length' getter in class 'String'.
-   *
-   * @param element the element being tested.
-   * @return
-   */
-  bool _isStringLength(Element element) {
-    if (element is! PropertyAccessorElement) {
-      return false;
-    }
-    PropertyAccessorElement accessor = element as PropertyAccessorElement;
-    if (!accessor.isGetter || accessor.name != "length") {
-      return false;
-    }
-    Element parent = accessor.enclosingElement;
-    return parent == _typeProvider.stringType.element;
-  }
 }
 
 /**