Move enable extensions define to a build flag.

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 62571b82516de3df883e82d740c172a18cd7bcc6..774779595c24c70a5f8e45b882d285e5064428f7 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -114,6 +114,7 @@
 #include "content/public/browser/user_metrics.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/page_zoom.h"
+#include "extensions/features/features.h"
 #include "printing/features/features.h"
 #include "ui/base/l10n/l10n_util.h"
 
@@ -137,7 +138,7 @@
 #include "components/policy/core/common/cloud/user_cloud_policy_manager.h"
 #endif
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_special_storage_policy.h"
 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
@@ -271,7 +272,7 @@ std::string ExitTypeToSessionTypePrefValue(Profile::ExitType type) {
 
 PrefStore* CreateExtensionPrefStore(Profile* profile,
                                     bool incognito_pref_store) {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   return new ExtensionPrefStore(
       ExtensionPrefValueMapFactory::GetForBrowserContext(profile),
       incognito_pref_store);
@@ -697,7 +698,7 @@ ProfileImpl::~ProfileImpl() {
     ProfileDestroyer::DestroyOffTheRecordProfileNow(
         off_the_record_profile_.get());
   } else {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
     ExtensionPrefValueMapFactory::GetForBrowserContext(this)->
         ClearAllIncognitoSessionOnlyPreferences();
 #endif
@@ -767,7 +768,7 @@ Profile* ProfileImpl::GetOffTheRecordProfile() {
 void ProfileImpl::DestroyOffTheRecordProfile() {
   off_the_record_profile_.reset();
   otr_prefs_->ClearMutableValues();
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   ExtensionPrefValueMapFactory::GetForBrowserContext(this)->
       ClearAllIncognitoSessionOnlyPreferences();
 #endif
@@ -800,7 +801,7 @@ bool ProfileImpl::IsLegacySupervised() const {
 
 ExtensionSpecialStoragePolicy*
     ProfileImpl::GetExtensionSpecialStoragePolicy() {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   if (!extension_special_storage_policy_.get()) {
     TRACE_EVENT0("browser", "ProfileImpl::GetExtensionSpecialStoragePolicy")
     extension_special_storage_policy_ = new ExtensionSpecialStoragePolicy(
@@ -953,7 +954,7 @@ net::SSLConfigService* ProfileImpl::GetSSLConfigService() {
 }
 
 content::BrowserPluginGuestManager* ProfileImpl::GetGuestManager() {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   return guest_view::GuestViewManager::FromBrowserContext(this);
 #else
   return NULL;
@@ -966,7 +967,7 @@ DownloadManagerDelegate* ProfileImpl::GetDownloadManagerDelegate() {
 }
 
 storage::SpecialStoragePolicy* ProfileImpl::GetSpecialStoragePolicy() {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   return GetExtensionSpecialStoragePolicy();
 #else
   return NULL;