Disable incremental linking on win x64 unit_tests, causing link failures

chrome/chrome_tests_unit.gypi

 # Copyright 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': {
     'chrome_unit_tests_sources': [
       '../apps/saved_files_service_unittest.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.h',
       '../components/autofill/content/renderer/test_password_generation_agent.cc',
@@ skipping 1944 matching lines @@
         '../ui/resources/ui_resources.gyp:ui_resources',
         'chrome_resources.gyp:chrome_resources',
         'chrome_resources.gyp:chrome_strings',
       ],
       'include_dirs': [
         '..',
       ],
       'msvs_settings': {
         'VCLinkerTool': {
           'conditions': [
-            ['incremental_chrome_dll==1', {
+            # Incremental linking on x64 causes LNK1248.
+            ['incremental_chrome_dll==1 and target_arch!="x64"', {
               'UseLibraryDependencyInputs': "true",
             }],
           ],
         },
       },
       'sources': [ '<@(chrome_unit_tests_sources)' ],
       'conditions': [
         ['OS!="ios"', {
           'dependencies': [
             '../components/components.gyp:autofill_content_test_support',
@@ skipping 959 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }