Include sync.pb.h in sync_data.h.

chrome/chrome.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.
 {
   'variables': {
     'chromium_code': 1,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 125 matching lines @@
             'chrome_resources.gyp:chrome_extra_resources',
             'chrome_resources.gyp:chrome_resources',
             'chrome_resources.gyp:chrome_strings',
             'chrome_resources.gyp:theme_resources',
             'common/extensions/api/api.gyp:api',
             '../base/base.gyp:base',
             '../content/content.gyp:content_browser',
             '../net/net.gyp:http_server',
             '../net/net.gyp:net',
             '../skia/skia.gyp:skia',
+            # Declaring a dependency on sync because debugger depends on
+            # browser, which depends on sync. We cannot simply declare a

[Nico, 2014/03/07 19:13:00]

In what way does debugger depend on browser? Does it include a header from
browser? Since a real dependency would be a cycle as you note, could this wrong
include be fixed instead?

[maniscalco, 2014/03/07 23:44:37]

Good question.  I've removed/replaced some #includes and used forward
declarations where possible.  This dependency is no longer needed.

+            # dependency on browser because that would create a cycle (browser
+            # already depends on debugger).
+            '../sync/sync.gyp:sync',
             '../third_party/icu/icu.gyp:icui18n',
             '../third_party/icu/icu.gyp:icuuc',
             '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
             '../third_party/libusb/libusb.gyp:libusb',
           ],
           'include_dirs': [
             '..',
           ],
           'sources': [
             'browser/devtools/adb/android_rsa.cc',
@@ skipping 948 matching lines @@
               'sources': [
                 'service/cloud_print/print_system_dummy.cc',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }