Replace extension_switch_utils.h with feature_switch.h.

BUG=135503
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Review URL: https://codereview.chromium.org/11030042

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@161725 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_install_prompt.cc b/chrome/browser/extensions/extension_install_prompt.cc
index a6af0293..7c4c544 100644
--- a/chrome/browser/extensions/extension_install_prompt.cc
+++ b/chrome/browser/extensions/extension_install_prompt.cc
@@ -28,7 +28,7 @@
 #include "chrome/common/extensions/extension_icon_set.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/extension_resource.h"
-#include "chrome/common/extensions/extension_switch_utils.h"
+#include "chrome/common/extensions/feature_switch.h"
 #include "chrome/common/extensions/permissions/permission_set.h"
 #include "chrome/common/extensions/url_pattern.h"
 #include "chrome/common/pref_names.h"
@@ -413,7 +413,7 @@
   // we need the UI confirmation.
   if (extension->is_theme()) {
     if (extension->from_webstore() ||
-        extensions::switch_utils::IsEasyOffStoreInstallEnabled()) {
+        extensions::FeatureSwitch::easy_off_store_install()->IsEnabled()) {
       delegate->InstallUIProceed();
       return;
     }