Refactor OS_LINUX preprocessor directive for LaCrOS effort.

Currently, ChromeOS defines the OS_LINUX directive as well as
OS_CHROMEOS.  We're working to separate these two, so we're
making the fact that OS_LINUX == OS_LINUX || OS_CHROMEOS
explicit.

Bug: 1110266
Change-Id: I5a906f5fd11894d2a618daced64235e8af558cd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354835
Reviewed-by: Lei Zhang <[email protected]>
Commit-Queue: Sean McAllister <[email protected]>
Cr-Commit-Position: refs/heads/master@{#797905}
diff --git a/chrome/browser/plugins/plugin_info_host_impl.cc b/chrome/browser/plugins/plugin_info_host_impl.cc
index d49a1df..d789ee0 100644
--- a/chrome/browser/plugins/plugin_info_host_impl.cc
+++ b/chrome/browser/plugins/plugin_info_host_impl.cc
@@ -382,7 +382,7 @@
     std::unique_ptr<component_updater::ComponentInfo> cus_plugin_info) {
   if (cus_plugin_info) {
     output->status = chrome::mojom::PluginStatus::kComponentUpdateRequired;
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS)
     if (cus_plugin_info->version != base::Version("0")) {
       output->status = chrome::mojom::PluginStatus::kRestartRequired;
     }