Omit save_password_infobar.cc from the build when unused

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index c7d40c3640e0eab6115a6bd2caab8e5a24e7d7cf..30174409a0257eb30f11234eed4ff50b6de69864 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -165,7 +165,6 @@
       'browser/password_manager/password_store_proxy_mac_unittest.cc',
       'browser/password_manager/password_store_win_unittest.cc',
       'browser/password_manager/password_store_x_unittest.cc',
-      'browser/password_manager/save_password_infobar_delegate_unittest.cc',
       'browser/password_manager/simple_password_store_mac_unittest.cc',
       'browser/permissions/permission_context_base_unittest.cc',
       'browser/permissions/permission_manager_unittest.cc',
@@ -561,6 +560,9 @@
       '../tools/json_schema_compiler/test/objects_unittest.cc',
       '../tools/json_schema_compiler/test/simple_api_unittest.cc',
     ],
+    'chrome_unit_tests_mac_android_sources': [
+      'browser/password_manager/save_password_infobar_delegate_unittest.cc',
+    ],
     'chrome_unit_tests_spellchecker_sources': [
       'browser/spellchecker/feedback_sender_unittest.cc',
       'browser/spellchecker/feedback_unittest.cc',
@@ -2529,6 +2531,9 @@
           # other things like the ui and startup tests. *shrug*
           'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
         }],
+        ['OS=="mac" or OS=="android"', {
+          'sources': [ '<@(chrome_unit_tests_mac_android_sources)' ],
+        }],
         ['OS!="mac" and OS!="ios"', {
           'dependencies': [
             '../third_party/hunspell/hunspell.gyp:hunspell',