Add CrOS's dbus-c++ to Chromium Linux. This is needed to build mtpd.

build/all.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'xcode_create_dependents_test_runner': 1,
@@ skipping 79 matching lines @@
             '../courgette/courgette.gyp:*',
             '../dbus/dbus.gyp:*',
             '../sandbox/sandbox.gyp:*',
           ],
           'conditions': [
             ['branding=="Chrome"', {
               'dependencies': [
                 '../chrome/chrome.gyp:linux_packages_<(channel)',
               ],
             }],
+            ['chromeos==0', {
+              'dependencies': [
+                '../third_party/cros_dbus_cplusplus/cros_dbus_cplusplus.gyp:*',
+              ],
+            }],
           ],
         }],
         ['toolkit_uses_gtk==1', {
           'dependencies': [
             '../tools/gtk_clipboard_dump/gtk_clipboard_dump.gyp:*',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:*',
           ],
         }],
         ['OS=="win"', {
           'conditions': [
@@ skipping 592 matching lines @@
             '../base/base.gyp:base_unittests_run',
             '../chrome/chrome.gyp:browser_tests_run',
             '../chrome/chrome.gyp:unit_tests_run',
             '../net/net.gyp:net_unittests_run',
           ],
         }, # target_name: chromium_swarm_tests
       ],
     }],
   ], # conditions
 }