Allow secondary tiles to be unpinned.

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 5ff86c5562cc9ac64b3a00e77b1e6040b56f8396..5fdb3c1b97de9e3bb2beaad2219a969cb31eef07 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -41,6 +41,7 @@
 #include "chrome/browser/ui/find_bar/find_bar_controller.h"
 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
 #include "chrome/browser/ui/fullscreen/fullscreen_controller.h"
+#include "chrome/browser/ui/metro_pin_tab_helper.h"
 #include "chrome/browser/ui/omnibox/location_bar.h"
 #include "chrome/browser/ui/search/search.h"
 #include "chrome/browser/ui/search/search_model.h"
@@ -599,10 +600,10 @@ bool CanBookmarkAllTabs(const Browser* browser) {
   return browser->tab_count() > 1 && CanBookmarkCurrentPage(browser);
 }
 
-#if !defined(OS_WIN)
-void PinCurrentPageToStartScreen(Browser* browser) {
+void TogglePagePinnedToStartScreen(Browser* browser) {
+  GetActiveTabContents(browser)->metro_pin_tab_helper()->
+      TogglePinnedToStartScreen();
 }
-#endif
 
 void SavePage(Browser* browser) {
   content::RecordAction(UserMetricsAction("SavePage"));