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

chrome/chrome_dll.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.
 {
   'conditions': [
     ['OS=="mac" or OS=="win"', {
       'targets': [
         {
           'target_name': 'chrome_dll',
           'type': 'none',
@@ skipping 264 matching lines @@
               },
               'sources': [
                 'app/chrome_command_ids.h',
                 'app/chrome_dll_resource.h',
                 'app/chrome_main.cc',
                 'app/chrome_main_delegate.cc',
                 'app/chrome_main_delegate.h',
                 'app/chrome_main_mac.mm',
                 'app/chrome_main_mac.h',
               ],
+              'dependencies': [
+                '../pdf/pdf.gyp:pdf',
+              ],
               'include_dirs': [
                 '<(grit_out_dir)',
               ],
               'postbuilds': [
                 {
                   # This step causes an error to be raised if the .order file
                   # does not account for all global text symbols.  It
                   # validates the completeness of the .order file.
                   'postbuild_name': 'Verify global text symbol order',
                   'variables': {
@@ skipping 17 matching lines @@
                     'app/chrome_breakpad_client.cc',
                     'app/chrome_breakpad_client.h',
                     'app/chrome_breakpad_client_mac.mm',
                   ],
                 }, {  # else: mac_breakpad_compiled_in!=1
                   # No Breakpad, put in the stubs.
                   'dependencies': [
                     '../components/components.gyp:breakpad_stubs',
                   ],
                 }],  # mac_breakpad_compiled_in
-                ['internal_pdf', {
-                  'dependencies': [
-                    '../pdf/pdf.gyp:pdf',
-                  ],
-                }],
               ],  # conditions
             }],  # OS=="mac"
           ],  # conditions
         },  # target chrome_main_dll
       ],  # targets
     }],  # OS=="mac" or OS=="win"
     ['OS=="win"', {
       'targets': [
         {
           # This target is only depended upon on Windows.
@@ skipping 62 matching lines @@
                   },
                 }],
               ]
             }],
           ],
         },  # target chrome_child_dll
       ],
     }],
   ],
 }