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

chrome/browser/plugins/plugin_observer.cc

Index: chrome/browser/plugins/plugin_observer.cc
diff --git a/chrome/browser/plugins/plugin_observer.cc b/chrome/browser/plugins/plugin_observer.cc
index 4285ab6b6d7aa1f2cf5b5a52e6d6b0a15321b58f..83857747fc8ca9d42085aaa967df255e55f70770 100644
--- a/chrome/browser/plugins/plugin_observer.cc
+++ b/chrome/browser/plugins/plugin_observer.cc
@@ -39,9 +39,6 @@
 #include "ui/gfx/vector_icons_public.h"
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
-#if defined(OS_WIN)
-#include "base/win/metro.h"
-#endif
 #include "chrome/browser/plugins/plugin_installer.h"
 #include "chrome/browser/plugins/plugin_installer_observer.h"
 #include "chrome/browser/ui/tab_modal_confirm_dialog_delegate.h"
@@ -438,10 +435,6 @@ void PluginObserver::OnCouldNotLoadPlugin(const base::FilePath& plugin_path) {
 
 void PluginObserver::OnNPAPINotSupported(const std::string& identifier) {
 #if defined(OS_WIN) && defined(ENABLE_PLUGIN_INSTALLATION)
-#if !defined(USE_AURA)
-  DCHECK(base::win::IsMetroProcess());
-#endif
-
   scoped_ptr<PluginMetadata> plugin;
   bool ret = PluginFinder::GetInstance()->FindPluginWithIdentifier(
       identifier, NULL, &plugin);