Use windows keycodes under linux (and all non-windows platforms).

base/base.gyp

 # Copyright (c) 2009 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,
   },
   'targets': [
     {
@@ skipping 139 matching lines @@
         'idle_timer.cc',
         'idle_timer.h',
         'idle_timer_none.cc',
         'id_map.h',
         'image_util.cc',
         'image_util.h',
         'json_reader.cc',
         'json_reader.h',
         'json_writer.cc',
         'json_writer.h',
+        'keyboard_code_conversion_gtk.cc',
+        'keyboard_code_conversion_gtk.h',
         'keyboard_codes.h',
         'keyboard_codes_win.h',
+        'keyboard_codes_posix.h',
         'lazy_instance.cc',
         'lazy_instance.h',
         'leak_tracker.h',
         'linked_list.h',
         'linked_ptr.h',
         'linux_util.cc',
         'linux_util.h',
         'lock.cc',
         'lock.h',
         'lock_impl.h',
@@ skipping 280 matching lines @@
         [ 'OS == "freebsd"', {
             'sources!': [
               'directory_watcher_inotify.cc',
             ],
             'sources': [
               'directory_watcher_stub.cc',
             ],
           },
         ],
         [ 'OS == "mac"', {
-            'sources/': [ ['exclude', '_(linux|win|chromeos)\\.cc$'] ],
+            'sources/': [ ['exclude', '_(linux|gtk|win|chromeos)\\.cc$'] ],
             'sources!': [
             ],
             'link_settings': {
               'libraries': [
                 '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
                 '$(SDKROOT)/System/Library/Frameworks/Carbon.framework',
                 '$(SDKROOT)/System/Library/Frameworks/CoreFoundation.framework',
                 '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
                 '$(SDKROOT)/System/Library/Frameworks/Security.framework',
               ],
             },
           },
           {  # else: OS != "mac"
             'sources!': [
               'crypto/cssm_init.cc',
               'crypto/cssm_init.h',
             ],
           }
         ],
         [ 'OS == "win"', {
             'include_dirs': [
               '../chrome/third_party/wtl/include',
             ],
-            'sources/': [ ['exclude', '_(linux|mac|posix|chromeos)\\.cc$'],
+            'sources/': [ ['exclude', '_(linux|gtk|mac|posix|chromeos)\\.cc$'],
                           ['exclude', '\\.mm?$' ] ],
             'sources': [
               'window_impl.cc',
               'window_impl.h',
             ],
             'sources!': [
               'data_pack.cc',
               'event_recorder_stubs.cc',
               'file_descriptor_shuffle.cc',
               'message_pump_libevent.cc',
@@ skipping 382 matching lines @@
                 '<@(_outputs)',
               ],
               'message': 'Generating version information',
             },
           ],
         },
       ],
     }],
   ],
 }