Convert enable_plugins to a buildflag header.

chrome/browser/ui/webui/version_handler.cc

Index: chrome/browser/ui/webui/version_handler.cc
diff --git a/chrome/browser/ui/webui/version_handler.cc b/chrome/browser/ui/webui/version_handler.cc
index f2dd9706447ac7ae161c27eecd2ff7d19d57a7cb..bea5fad951372f321d58a2a2d105788331062de4 100644
--- a/chrome/browser/ui/webui/version_handler.cc
+++ b/chrome/browser/ui/webui/version_handler.cc
@@ -22,6 +22,7 @@
 #include "content/public/browser/plugin_service.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/common/content_constants.h"
+#include "ppapi/features/features.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "url/gurl.h"
 
@@ -64,7 +65,7 @@ void VersionHandler::RegisterMessages() {
 }
 
 void VersionHandler::HandleRequestVersionInfo(const base::ListValue* args) {
-#if defined(ENABLE_PLUGINS)
+#if BUILDFLAG(ENABLE_PLUGINS)
   // The Flash version information is needed in the response, so make sure
   // the plugins are loaded.
   content::PluginService::GetInstance()->GetPlugins(
@@ -101,7 +102,7 @@ void VersionHandler::OnGotFilePaths(base::string16* executable_path_data,
                                          exec_path, profile_path);
 }
 
-#if defined(ENABLE_PLUGINS)
+#if BUILDFLAG(ENABLE_PLUGINS)
 void VersionHandler::OnGotPlugins(
     const std::vector<content::WebPluginInfo>& plugins) {
   // Obtain the version of the first enabled Flash plugin.
@@ -124,4 +125,4 @@ void VersionHandler::OnGotPlugins(
   base::StringValue arg(flash_version);
   web_ui()->CallJavascriptFunctionUnsafe(version_ui::kReturnFlashVersion, arg);
 }
-#endif  // defined(ENABLE_PLUGINS)
+#endif  // BUILDFLAG(ENABLE_PLUGINS)