Move enable extensions define to a build flag.

chrome/browser/plugins/chrome_content_browser_client_plugins_part.cc

Index: chrome/browser/plugins/chrome_content_browser_client_plugins_part.cc
diff --git a/chrome/browser/plugins/chrome_content_browser_client_plugins_part.cc b/chrome/browser/plugins/chrome_content_browser_client_plugins_part.cc
index 70ffc9b28959e89ff434679bbe540e44e901af07..f9d68ce52941fd77fc8d38bd71fe96762aec13be 100644
--- a/chrome/browser/plugins/chrome_content_browser_client_plugins_part.cc
+++ b/chrome/browser/plugins/chrome_content_browser_client_plugins_part.cc
@@ -13,10 +13,11 @@
 #include "chrome/common/pepper_permission_util.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/render_process_host.h"
+#include "extensions/features/features.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/shared_impl/ppapi_switches.h"
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/extension_service.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/constants.h"
@@ -44,7 +45,7 @@ bool ChromeContentBrowserClientPluginsPart::
         content::BrowserContext* browser_context,
         const GURL& url,
         const std::set<std::string>& allowed_file_handle_origins) {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   Profile* profile = Profile::FromBrowserContext(browser_context);
   const extensions::ExtensionSet* extension_set = NULL;
   if (profile) {
@@ -67,7 +68,7 @@ bool ChromeContentBrowserClientPluginsPart::AllowPepperSocketAPI(
     bool private_api,
     const content::SocketPermissionRequest* params,
     const std::set<std::string>& allowed_socket_origin) {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   Profile* profile = Profile::FromBrowserContext(browser_context);
   const extensions::ExtensionSet* extension_set = NULL;
   if (profile) {
@@ -116,7 +117,7 @@ bool ChromeContentBrowserClientPluginsPart::AllowPepperSocketAPI(
 bool ChromeContentBrowserClientPluginsPart::IsPepperVpnProviderAPIAllowed(
     content::BrowserContext* browser_context,
     const GURL& url) {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   Profile* profile = Profile::FromBrowserContext(browser_context);
   if (!profile)
     return false;
@@ -151,7 +152,7 @@ bool ChromeContentBrowserClientPluginsPart::IsPluginAllowedToUseDevChannelAPIs(
     return true;
   }
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   Profile* profile = Profile::FromBrowserContext(browser_context);
   const extensions::ExtensionSet* extension_set = NULL;
   if (profile) {