Move some global feature defines to buildflags

chrome/browser/plugins/plugin_infobar_delegates.h

Index: chrome/browser/plugins/plugin_infobar_delegates.h
diff --git a/chrome/browser/plugins/plugin_infobar_delegates.h b/chrome/browser/plugins/plugin_infobar_delegates.h
index 59a0ef404a8efd3dbd35d51f3d16884ed0714460..1ed4bc4dd579fd6719fefabfc0be92da21143f76 100644
--- a/chrome/browser/plugins/plugin_infobar_delegates.h
+++ b/chrome/browser/plugins/plugin_infobar_delegates.h
@@ -8,10 +8,11 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "build/build_config.h"
+#include "chrome/common/features.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 #include "url/gurl.h"
 
-#if defined(ENABLE_PLUGIN_INSTALLATION)
+#if BUILDFLAG(ENABLE_PLUGIN_INSTALLATION)
 #include "chrome/browser/plugins/plugin_installer_observer.h"
 #endif
 
@@ -23,7 +24,7 @@ namespace content {
 class WebContents;
 }
 
-#if defined(ENABLE_PLUGIN_INSTALLATION)
+#if BUILDFLAG(ENABLE_PLUGIN_INSTALLATION)
 // Infobar that's shown when a plugin is out of date.
 class OutdatedPluginInfoBarDelegate : public ConfirmInfoBarDelegate,
                                       public WeakPluginInstallerObserver {
@@ -79,6 +80,6 @@ class OutdatedPluginInfoBarDelegate : public ConfirmInfoBarDelegate,
 
   DISALLOW_COPY_AND_ASSIGN(OutdatedPluginInfoBarDelegate);
 };
-#endif  // defined(ENABLE_PLUGIN_INSTALLATION)
+#endif  // BUILDFLAG(ENABLE_PLUGIN_INSTALLATION)
 
 #endif  // CHROME_BROWSER_PLUGINS_PLUGIN_INFOBAR_DELEGATES_H_