Linux: clean up the usage of "use_cups" gyp switch:

chrome/chrome.gyp

 # 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.
 {
   'variables': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 789 matching lines @@
           'sources': [
             'service/cloud_print/print_system_win.cc',
           ],
         }],
         ['OS=="linux"', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
           ],
         }],
         ['use_cups==1', {
+          'dependencies': [
+            '../printing/printing.gyp:cups',
+          ],
           'defines': [
             # CP_PRINT_SYSTEM_AVAILABLE disables default dummy implementation
             # of cloud print system, and allows to use custom implementaiton.
             'CP_PRINT_SYSTEM_AVAILABLE',
           ],
           'sources': [
             'service/cloud_print/print_system_cups.cc',
           ],
-          'conditions': [
-            ['OS=="mac"', {
-              'link_settings': {
-                'libraries': [
-                  '$(SDKROOT)/usr/lib/libcups.dylib',
-                ]
-              },
-            }, {
-              'link_settings': {
-                'libraries': [
-                  '-lcups',
-                  '-lgcrypt',
-                ],
-              },
-            }],
-          ],
         }],
         ['remoting==1', {
           'dependencies': [
             '../remoting/remoting.gyp:chromoting_host',
           ],
         }],
         ['remoting==0', {
           'sources!': [
             'service/remoting/chromoting_host_manager.cc',
             'service/remoting/chromoting_host_manager.h',
@@ skipping 758 matching lines @@
       }],  # targets
     }],  # OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"
   ],  # 'conditions'
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: