Fix some compilation errors and warnings in Pub.

Review URL: https://chromiumcodereview.appspot.com//10880055

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@11355 260f80e4-7a28-3924-810f-c04153c831b5

lib/src/package.dart

@@ -43,7 +43,7 @@ class Package {
   /**
    * The name of the package.
    */
-  String get name() {
+  String get name {
     if (pubspec.name != null) return pubspec.name;
     if (dir != null) return basename(dir);
     return null;

lib/src/pubspec.dart

@@ -38,7 +38,7 @@ class Pubspec {
       dependencies = <PackageRef>[];
 
   /** Whether or not the pubspec has no contents. */
-  bool get isEmpty() =>
+  bool get isEmpty =>
     name == null && version == Version.none && dependencies.isEmpty();
 
   /**

lib/src/root_source.dart

@@ -5,6 +5,7 @@
 #library('root_source');
 
 #import('package.dart');
+#import('pubspec.dart');
 #import('source.dart');
 
 /**
@@ -21,7 +22,7 @@ class RootSource extends Source {
   RootSource(this.package);
 
   Future<Pubspec> describe(PackageId id) {
-    return Future<Pubspec>.immediate(package.pubspec);
+    return new Future<Pubspec>.immediate(package.pubspec);
   }
 
   Future<bool> install(PackageId id, String destPath) {

lib/src/version_solver.dart

@@ -447,7 +447,7 @@ class RemoveConstraint extends ChangeConstraint {
     return _processChange(solver, oldDependency, dependency);
   }
 
-  void undo() {
+  void undo(VersionSolver solver) {
     solver.getDependency(dependent).placeConstraint(depender, _removed);
   }
 }