Omit save_password_infobar.cc from the build when unused

chrome/test/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
 import("//chrome/test/base/js2gtest.gni")
@@ skipping 1767 matching lines @@
       deps += [
         "//third_party/google_toolbox_for_mac",
         "//third_party/ocmock",
       ]
 
       # TODO(mark): We really want this for all non-static library targets,
       # but when we tried to pull it up to the common.gypi level, it broke
       # other things like the ui and startup tests. *shrug*
       ldflags = [ "-Wl,-ObjC" ]
     }
+    if (is_mac || is_android) {
+      sources += rebase_path(
+              chrome_tests_unit_gypi_values.chrome_unit_tests_mac_android_sources,
+              ".",
+              "//chrome")
+    }
     if (!is_mac && !is_ios) {
       deps += [
         "//chrome/tools/convert_dict:lib",
         "//chrome:packed_extra_resources",
         "//chrome:packed_resources",
         "//third_party/hunspell",
       ]
     }
     if (is_win || is_mac) {
       sources += rebase_path(
@@ skipping 209 matching lines @@
     "//third_party/mojo/src/mojo/edk/system",
   ]
 
   if (!is_android && use_ash) {
     sources += rebase_path(
             chrome_tests_unit_gypi_values.chrome_test_support_unit_ash_sources,
             ".",
             "//chrome")
   }
 }