Cleanup: Make TogglePinnedToStartScreen() Windows only.

chrome/browser/ui/browser_commands.cc

Index: chrome/browser/ui/browser_commands.cc
diff --git a/chrome/browser/ui/browser_commands.cc b/chrome/browser/ui/browser_commands.cc
index 76c73ebf2732615c102e06616997d39516bce80f..351396bd7ef6364f160c1a9808c9233ae80ae91c 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -815,13 +815,13 @@ void ManagePasswordsForPage(Browser* browser) {
   chrome::ShowManagePasswordsBubble(web_contents);
 }
 
-void TogglePagePinnedToStartScreen(Browser* browser) {
 #if defined(OS_WIN)
+void TogglePagePinnedToStartScreen(Browser* browser) {
   MetroPinTabHelper::FromWebContents(
       browser->tab_strip_model()->GetActiveWebContents())->
           TogglePinnedToStartScreen();
-#endif
 }
+#endif
 
 void SavePage(Browser* browser) {
   content::RecordAction(UserMetricsAction("SavePage"));