Use <(SHARED_LIB_DIR) instead of <(PRODUCT_DIR)/lib.

chrome/chrome_installer.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.
 
 {
   'variables': {
     'lastchange_path': '../build/util/LASTCHANGE',
     'libpeer_target_type%': 'static_library',
     # 'branding_dir' is set in the 'conditions' section at the bottom.
   },
@@ skipping 572 matching lines @@
             'deb_arch': 'arm',
             'rpm_arch': 'arm',
           }],
           ['internal_pdf', {
             'packaging_files_binaries': [
               '<(PRODUCT_DIR)/libpdf.so',
             ],
           }],
           ['libpeer_target_type=="shared_library"', {
             'packaging_files_binaries': [
-              '<(PRODUCT_DIR)/lib.target/libpeerconnection.so',
+              '<(SHARED_LIB_DIR)/libpeerconnection.so',
             ],
           }],
         ],
       },
       'targets': [
         {
           'target_name': 'linux_installer_configs',
           'type': 'none',
           # Add these files to the build output so the build archives will be
           # "hermetic" for packaging. This is only for branding="Chrome" since
@@ skipping 604 matching lines @@
          'branding_dir_100': 'app/theme/default_100_percent/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': 'app/theme/chromium',
          'branding_dir_100': 'app/theme/default_100_percent/chromium',
       },
     }],
   ],
 }