Omit save_password_infobar.cc from the build when unused

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index c33ec1de73875c67ee6c0af517eede32e021238e..723d86f9d940be6cf2901fc38cc04f9bca00a8f5 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -2063,11 +2063,14 @@
       'browser/password_manager/password_store_win.h',
       'browser/password_manager/password_store_x.cc',
       'browser/password_manager/password_store_x.h',
-      'browser/password_manager/save_password_infobar_delegate.cc',
-      'browser/password_manager/save_password_infobar_delegate.h',
       'browser/password_manager/simple_password_store_mac.cc',
       'browser/password_manager/simple_password_store_mac.h',
     ],
+    # Used on Mac and Android platforms.
+    'chrome_browser_password_manager_mac_android_sources': [
+      'browser/password_manager/save_password_infobar_delegate.cc',
+      'browser/password_manager/save_password_infobar_delegate.h',
+    ],
     'chrome_browser_permissions_sources': [
       'browser/permissions/permission_bubble_request_impl.cc',
       'browser/permissions/permission_bubble_request_impl.h',
@@ -3387,6 +3390,11 @@
           ],
           'sources': [ '<@(chrome_browser_mac_sources)' ]
         }],
+        ['OS=="mac" or OS=="android"', {
+          'sources': [
+            '<@(chrome_browser_password_manager_mac_android_sources)',
+          ],
+        }],
         ['chromeos==1', {
           'sources!': [
             'browser/metrics/signin_status_metrics_provider.cc',