Update pub to new getter syntax.

utils/pub/command_install.dart

Index: utils/pub/command_install.dart
diff --git a/utils/pub/command_install.dart b/utils/pub/command_install.dart
index 8c8351e9beb0e970ecd813a78abd05ac696bd316..92266759868682c887ceefac39d42dbcde9cc168 100644
--- a/utils/pub/command_install.dart
+++ b/utils/pub/command_install.dart
@@ -9,13 +9,12 @@
 
 /** Handles the `install` pub command. */
 class InstallCommand extends PubCommand {
-  String get description() => "install the current package's dependencies";
-
-  String get usage() => 'pub install';
+  String get description => "install the current package's dependencies";
+  String get usage => "pub install";
 
   Future onRun() {
     return entrypoint.installDependencies().transform((_) {
-      print('Dependencies installed!');
+      print("Dependencies installed!");
     });
   }
 }