Convert enable_plugins to a buildflag header.

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index 774779595c24c70a5f8e45b882d285e5064428f7..9c4752f9e99322b3d7c62c50f15fe83525a7a52e 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -115,6 +115,7 @@
 #include "content/public/common/content_constants.h"
 #include "content/public/common/page_zoom.h"
 #include "extensions/features/features.h"
+#include "ppapi/features/features.h"
 #include "printing/features/features.h"
 #include "ui/base/l10n/l10n_util.h"
 
@@ -621,7 +622,7 @@ void ProfileImpl::DoFinalInit() {
                 session_cookie_mode, GetSpecialStoragePolicy(),
                 CreateDomainReliabilityMonitor(local_state));
 
-#if defined(ENABLE_PLUGINS)
+#if BUILDFLAG(ENABLE_PLUGINS)
   ChromePluginServiceFilter::GetInstance()->RegisterResourceContext(
       this, io_data_.GetResourceContextNoInit());
 #endif
@@ -688,7 +689,7 @@ ProfileImpl::~ProfileImpl() {
   // Remove pref observers
   pref_change_registrar_.RemoveAll();
 
-#if defined(ENABLE_PLUGINS)
+#if BUILDFLAG(ENABLE_PLUGINS)
   ChromePluginServiceFilter::GetInstance()->UnregisterResourceContext(
       io_data_.GetResourceContextNoInit());
 #endif