Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/shelf_static/test/get_handler_test.dart

+// Copyright (c) 2015, 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.
+
+library shelf_static.get_handler_test;
+
+import 'dart:io';
+import 'package:path/path.dart' as p;
+import 'package:scheduled_test/descriptor.dart' as d;
+import 'package:scheduled_test/scheduled_test.dart';
+
+import 'package:shelf_static/shelf_static.dart';
+
+void main() {
+  setUp(() {
+    var tempDir;
+    schedule(() {
+      return Directory.systemTemp.createTemp('shelf_static-test-').then((dir) {
+        tempDir = dir;
+        d.defaultRoot = tempDir.path;
+      });
+    });
+
+    d.file('root.txt', 'root txt').create();
+    d
+        .dir('files', [
+      d.file('test.txt', 'test txt content'),
+      d.file('with space.txt', 'with space content')
+    ])
+        .create();
+
+    currentSchedule.onComplete.schedule(() {
+      d.defaultRoot = null;
+      return tempDir.delete(recursive: true);
+    });
+  });
+
+  test('non-existent relative path', () {
+    schedule(() {
+      expect(() => createStaticHandler('random/relative'), throwsArgumentError);
+    });
+  });
+
+  test('existing relative path', () {
+    schedule(() {
+      var existingRelative = p.relative(d.defaultRoot);
+      expect(() => createStaticHandler(existingRelative), returnsNormally);
+    });
+  });
+
+  test('non-existent absolute path', () {
+    schedule(() {
+      var nonExistingAbsolute = p.join(d.defaultRoot, 'not_here');
+      expect(
+          () => createStaticHandler(nonExistingAbsolute), throwsArgumentError);
+    });
+  });
+
+  test('existing absolute path', () {
+    schedule(() {
+      expect(() => createStaticHandler(d.defaultRoot), returnsNormally);
+    });
+  });
+}