CrOS: Exclude PDF crash symbol generation.

chrome/chrome_exe.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.
 
 {
   'targets': [
     {
       'target_name': 'chrome',
       'type': 'executable',
       'mac_bundle': 1,
@@ skipping 398 matching lines @@
             # NOTE: chrome/app/theme/chromium/BRANDING and
             # chrome/app/theme/google_chrome/BRANDING have the short name
             # "chrome" etc.; should we try to extract from there instead?
 
             # On Mac, this is done in chrome_dll.gypi.
             ['internal_pdf', {
               'dependencies': [
                 '../pdf/pdf.gyp:pdf',
               ],
               'conditions': [
-                ['OS=="linux" and linux_dump_symbols==1', {
+                # TODO(thestig) It would be nice to do this for CrOS as well,
+                # but when I tried that, it failed because dump_syms is built
+                # for the target arch rather than the host arch.
+                # http://crbug.com/140571
+                ['OS=="linux" and chromeos==0 and linux_dump_symbols==1', {
                   'dependencies': [
                     '../pdf/pdf.gyp:pdf_linux_symbols',
                   ],
                 }], # OS=="linux" and linux_dump_symbols==1
               ],
             }], # internal_pdf
           ],
           'dependencies': [
             'chrome_resources.gyp:packed_extra_resources',
             'chrome_resources.gyp:packed_resources',
@@ skipping 167 matching lines @@
               'target_name': 'chrome_nacl_win64',
               'type': 'none',
               'sources': [],
             },
           ],
         }],
       ],
     }],
   ],
 }