Fix compile on linux_redux bots

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 4172 matching lines @@
         }, {  # safe_browsing==0
           'dependencies!': [
             'safe_browsing_report_proto',
           ],
           'sources!': [
             'browser/renderer_host/safe_browsing_resource_handler.cc',
             'browser/renderer_host/safe_browsing_resource_handler.h',
           ],
           'sources/': [
             ['exclude', '^browser/safe_browsing/'],
+            ['include', '^browser/safe_browsing/safe_browsing_tab_observer.cc'],
+            ['include', '^browser/safe_browsing/safe_browsing_tab_observer.h'],
           ],
         }],
         ['chromeos==0', {
           'sources/': [
             ['exclude', '^browser/chromeos'],
             ['exclude', '^browser/ui/webui/chromeos'],
             ['exclude', '^browser/ui/webui/options/chromeos'],
             ['exclude', '^browser/ui/webui/options2/chromeos'],
             ['exclude', 'browser/extensions/api/terminal/terminal_private_api.cc'],
             ['exclude', 'browser/extensions/api/terminal/terminal_private_api.h'],
@@ skipping 1182 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }