Put the pop-up app launcher behind a compile-time flag, and provide defines.

chrome/chrome_browser.gypi

 # 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': 'browser',
       'type': 'static_library',
@@ skipping 2729 matching lines @@
         }],
         ['OS=="win"', {
           'include_dirs': [
             '<(DEPTH)/third_party/wtl/include',
           ],
           'dependencies': [
             'installer_util_strings',
             '../google_update/google_update.gyp:google_update',
             '../third_party/iaccessible2/iaccessible2.gyp:iaccessible2',
             '../third_party/isimpledom/isimpledom.gyp:isimpledom',
-            '../ui/app_list/app_list.gyp:app_list',
             '../ui/views/controls/webview/webview.gyp:webview',
             '../ui/views/views.gyp:views',
           ],
           'export_dependent_settings': [
             '../ui/views/controls/webview/webview.gyp:webview',
             '../ui/views/views.gyp:views',
           ],
           'sources': [
             # Using built-in rule in vstudio for midl.
             'browser/history/history_indexer.idl',
@@ skipping 86 matching lines @@
             'browser/protector/protector_service.cc',
             'browser/protector/protector_service.h',
             'browser/protector/protector_service_factory.cc',
             'browser/protector/protector_service_factory.h',
             'browser/protector/session_startup_change.cc',
             'browser/protector/settings_change_global_error.cc',
             'browser/protector/settings_change_global_error.h',
             'browser/protector/settings_change_global_error_delegate.h',
           ],
         }],
-        [ 'use_openssl==1', {
+        ['use_openssl==1', {
           'sources!': [
             'browser/importer/nss_decryptor.cc',
             'browser/importer/nss_decryptor_system_nss.cc',
             'browser/importer/nss_decryptor_system_nss.h',
-          ]},
-        ],
+          ]
+        }],
+        ['enable_app_list==1', {
+          'dependencies': [
+            '../ui/app_list/app_list.gyp:app_list',
+          ]
+        }],
       ],
       'target_conditions': [
         # Need 'target_conditions' to override default filename_rules to include
         # the files on Android.
         ['OS=="android"', {
           'sources/': [
             ['include', '^app/breakpad_linux\\.cc$'],
             ['include', '^browser/crash_handler_host_linux\\.cc$'],
             ['include', '^browser/crash_handler_host_linux_stub\\.cc$'],
           ],
@@ skipping 155 matching lines @@
             'proto_in_dir': '../third_party/cros_system_api/dbus',
             'proto_out_dir': 'chrome/browser/media_transfer_protocol',
           },
           'includes': ['../build/protoc.gypi'],
         },
       ],
      },
     ],
   ],
 }