Only refer to _WIN resources on Windows.

The code only works as is because GRIT does not properly respect an 'is_win' conditional.

Review URL: https://codereview.chromium.org/133563002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244316 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/managed_mode/managed_user_theme.cc

@@ -21,14 +21,20 @@ const SkColor kDefaultColorManagedUserLabelBackground =
 int MapToManagedUserResourceIds(int id) {
   switch (id) {
     case IDR_THEME_FRAME:
+#if defined(OS_WIN)
     case IDR_THEME_FRAME_WIN:
+#endif
       return IDR_MANAGED_USER_THEME_FRAME;
     case IDR_THEME_FRAME_INACTIVE:
+#if defined(OS_WIN)
     case IDR_THEME_FRAME_INACTIVE_WIN:
+#endif
       return IDR_MANAGED_USER_THEME_FRAME_INACTIVE;
     case IDR_THEME_TAB_BACKGROUND:
     case IDR_THEME_TAB_BACKGROUND_V:
+#if defined(OS_WIN)
     case IDR_THEME_TAB_BACKGROUND_WIN:
+#endif
       return IDR_MANAGED_USER_THEME_TAB_BACKGROUND;
   }
   return id;