Add the pdf plugin's source in src\pdf.

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 477 matching lines @@
           'installer/linux/rpm/chrome.spec.template',
           'installer/linux/rpm/expected_deps_i386',
           'installer/linux/rpm/expected_deps_x86_64',
         ],
         'packaging_files_binaries': [
           # TODO(mmoss) Any convenient way to get all the relevant build
           # files? (e.g. all locales, resources, etc.)
           '<(PRODUCT_DIR)/chrome',
           '<(PRODUCT_DIR)/chrome_sandbox',
           '<(PRODUCT_DIR)/libffmpegsumo.so',
+          '<(PRODUCT_DIR)/libpdf.so',
           '<(PRODUCT_DIR)/libppGoogleNaClPluginChrome.so',
           '<(PRODUCT_DIR)/xdg-mime',
           '<(PRODUCT_DIR)/xdg-settings',
           '<(PRODUCT_DIR)/locales/en-US.pak',
           '<(PRODUCT_DIR)/nacl_helper',
           '<(PRODUCT_DIR)/nacl_helper_bootstrap',
           '<(PRODUCT_DIR)/PepperFlash/libpepflashplayer.so',
           '<(PRODUCT_DIR)/PepperFlash/manifest.json',
           '<@(default_apps_list_linux_dest)',
         ],
@@ skipping 26 matching lines @@
               '<(PRODUCT_DIR)/libwidevinecdm.so',
             ],
             'packaging_files_common': [
               '<!(which eu-strip)',
             ],
           }],
           ['target_arch=="arm"', {
             'deb_arch': 'arm',
             'rpm_arch': 'arm',
           }],
-          ['internal_pdf', {
-            'packaging_files_binaries': [
-              '<(PRODUCT_DIR)/libpdf.so',
-            ],
-          }],
           ['libpeer_target_type!="static_library"', {
             'packaging_files_binaries': [
               '<(PRODUCT_DIR)/lib/libpeerconnection.so',
             ],
           }],
         ],
       },
       'targets': [
         {
           'target_name': 'linux_installer_configs',
@@ skipping 573 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',
       },
     }],
   ],
 }