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

mojo/public/dart/third_party/test/lib/src/runner/browser/firefox.dart

Index: mojo/public/dart/third_party/test/lib/src/runner/browser/firefox.dart
diff --git a/mojo/public/dart/third_party/test/lib/src/runner/browser/firefox.dart b/mojo/public/dart/third_party/test/lib/src/runner/browser/firefox.dart
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+// 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 test.runner.browser.firefox;
+
+import 'dart:async';
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+
+import '../../util/io.dart';
+import 'browser.dart';
+
+final _preferences = '''
+user_pref("browser.shell.checkDefaultBrowser", false);
+user_pref("dom.disable_open_during_load", false);
+user_pref("dom.max_script_run_time", 0);
+''';
+
+/// A class for running an instance of Firefox.
+///
+/// Most of the communication with the browser is expected to happen via HTTP,
+/// so this exposes a bare-bones API. The browser starts as soon as the class is
+/// constructed, and is killed when [close] is called.
+///
+/// Any errors starting or running the process are reported through [onExit].
+class Firefox extends Browser {
+  final name = "Firefox";
+
+  Firefox(url, {String executable})
+      : super(() => _startBrowser(url, executable));
+
+  /// Starts a new instance of Firefox open to the given [url], which may be a
+  /// [Uri] or a [String].
+  ///
+  /// If [executable] is passed, it's used as the Firefox executable.
+  /// Otherwise the default executable name for the current OS will be used.
+  static Future<Process> _startBrowser(url, [String executable]) async {
+    if (executable == null) executable = _defaultExecutable();
+
+    var dir = createTempDir();
+    new File(p.join(dir, 'prefs.js')).writeAsStringSync(_preferences);
+
+    var process = await Process.start(executable, [
+      "--profile", "$dir",
+      url.toString(),
+      "--no-remote"
+    ], environment: {
+      "MOZ_CRASHREPORTER_DISABLE": "1"
+    });
+
+    process.exitCode
+        .then((_) => new Directory(dir).deleteSync(recursive: true));
+
+    return process;
+  }
+
+  /// Return the default executable for the current operating system.
+  static String _defaultExecutable() {
+    if (Platform.isMacOS) {
+      return '/Applications/Firefox.app/Contents/MacOS/firefox-bin';
+    }
+    if (!Platform.isWindows) return 'firefox';
+
+    // Firefox could be installed in several places on Windows. The only way to
+    // find it is to check.
+    var prefixes = [
+      Platform.environment['PROGRAMFILES'],
+      Platform.environment['PROGRAMFILES(X86)']
+    ];
+    var suffix = r'Mozilla Firefox\firefox.exe';
+
+    for (var prefix in prefixes) {
+      if (prefix == null) continue;
+
+      var path = p.join(prefix, suffix);
+      if (new File(p.join(prefix, suffix)).existsSync()) return path;
+    }
+
+    // Fall back on looking it up on the path. This probably won't work, but at
+    // least it will fail with a useful error message.
+    return "firefox.exe";
+  }
+}