Move InfoBarResponder into its own file.

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 417 matching lines @@
       'browser/icon_loader_android.cc',
       'browser/icon_loader_chromeos.cc',
       'browser/icon_loader_mac.mm',
       'browser/icon_loader_win.cc',
       'browser/icon_manager.cc',
       'browser/icon_manager.h',
       'browser/image_decoder.cc',
       'browser/image_decoder.h',
       'browser/image_holder.cc',
       'browser/image_holder.h',
+      'browser/infobars/infobar_responder.cc',
+      'browser/infobars/infobar_responder.h',
       'browser/infobars/infobar_service.cc',
       'browser/infobars/infobar_service.h',
       'browser/infobars/insecure_content_infobar_delegate.cc',
       'browser/infobars/insecure_content_infobar_delegate.h',
       'browser/install_verification/win/imported_module_verification.cc',
       'browser/install_verification/win/imported_module_verification.h',
       'browser/install_verification/win/install_verification.cc',
       'browser/install_verification/win/install_verification.h',
       'browser/install_verification/win/loaded_module_verification.cc',
       'browser/install_verification/win/loaded_module_verification.h',
@@ skipping 3397 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }