Make all pdb file names follow the same naming convention.

chrome/chrome_syzygy.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.
 {
   'conditions': [
     ['OS=="win" and fastbuild==0', {
       # Reorder the initial chrome DLL executable, placing the optimized
       # output and corresponding PDB file into the "syzygy" subdirectory.
       # If there's a matching chrome.dll-ordering.json file present in
       # the output directory, chrome.dll will be ordered according to that,
       # otherwise it will be randomized.
       # This target won't build in fastbuild, since there are no PDBs.
       'targets': [
         {
           'target_name': 'chrome_dll_syzygy',
           'type': 'none',
           'sources' : [],
           'dependencies': [
             '<(DEPTH)/chrome/chrome.gyp:chrome_dll',
           ],
           'variables': {
             'dest_dir': '<(PRODUCT_DIR)\\syzygy',
           },
           'actions': [
             {
               'action_name': 'Reorder Chrome with Syzygy',
               'msvs_cygwin_shell': 0,
               'inputs': [
                 '<(PRODUCT_DIR)\\chrome.dll',
-                '<(PRODUCT_DIR)\\chrome_dll.pdb',
+                '<(PRODUCT_DIR)\\chrome.dll.pdb',
               ],
               'outputs': [
                 '<(dest_dir)\\chrome.dll',
-                '<(dest_dir)\\chrome_dll.pdb',
+                '<(dest_dir)\\chrome.dll.pdb',
               ],
               'action': [
                 'python',
                 '<(DEPTH)/chrome/tools/build/win/syzygy_reorder.py',
                 '--input_executable', '<(PRODUCT_DIR)\\chrome.dll',
-                '--input_symbol', '<(PRODUCT_DIR)\\chrome_dll.pdb',
+                '--input_symbol', '<(PRODUCT_DIR)\\chrome.dll.pdb',
                 '--destination_dir', '<(dest_dir)',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }