Linux: add option to use system nspr.

base/base.gyp

 # 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': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
     'base.gypi',
   ],
   'targets': [
     {
       'target_name': 'base',
       'type': '<(component)',
       'toolsets': ['host', 'target'],
       'variables': {
         'base_target': 1,
         'enable_wexit_time_destructors': 1,
         'optimize': 'max',
       },
       'dependencies': [
         'base_static',
         'allocator/allocator.gyp:allocator_extension_thunks',
         '../testing/gtest.gyp:gtest_prod',
         '../third_party/modp_b64/modp_b64.gyp:modp_b64',
         'third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
+        'third_party/nspr/nspr.gyp:nspr',
       ],
       # TODO(gregoryd): direct_dependent_settings should be shared with the
       #  64-bit target, but it doesn't work due to a bug in gyp
       'direct_dependent_settings': {
         'include_dirs': [
           '..',
         ],
       },
       'conditions': [
         ['use_glib==1', {
@@ skipping 542 matching lines @@
         'win/win_util_unittest.cc',
         'win/wrapped_window_proc_unittest.cc',
       ],
       'dependencies': [
         'base',
         'base_i18n',
         'base_static',
         'run_all_unittests',
         'test_support_base',
         'third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
+        'third_party/nspr/nspr.gyp:nspr',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
       ],
       'includes': ['../build/nocompile.gypi'],
       'variables': {
          # TODO(ajwong): Is there a way to autodetect this?
         'module_dir': 'base'
       },
@@ skipping 508 matching lines @@
             'base_unittests.isolate',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }