Remove base/win/metro.{cc|h} and some associated code

chrome/browser/ui/tab_helpers.cc

Index: chrome/browser/ui/tab_helpers.cc
diff --git a/chrome/browser/ui/tab_helpers.cc b/chrome/browser/ui/tab_helpers.cc
index 69964d2a724322f0bbe5615a12c9f33892e02fa4..97a1586a714aa52d0208b4cacb24715d479bd7d1 100644
--- a/chrome/browser/ui/tab_helpers.cc
+++ b/chrome/browser/ui/tab_helpers.cc
@@ -73,10 +73,6 @@
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #endif  // BUILDFLAG(ANDROID_JAVA_UI)
 
-#if defined(OS_WIN)
-#include "chrome/browser/ui/metro_pin_tab_helper_win.h"
-#endif
-
 #if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
 #include "chrome/browser/captive_portal/captive_portal_tab_helper.h"
 #endif
@@ -212,10 +208,6 @@ void TabHelpers::AttachTabHelpers(WebContents* web_contents) {
   }
 #endif
 
-#if defined(OS_WIN)
-  MetroPinTabHelper::CreateForWebContents(web_contents);
-#endif
-
   // --- Feature tab helpers behind flags ---
 
 #if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)