Cleanup: Remove most enable_extensions logic in extensions code.

extensions/common/permissions/usb_device_permission_unittest.cc

Index: extensions/common/permissions/usb_device_permission_unittest.cc
diff --git a/extensions/common/permissions/usb_device_permission_unittest.cc b/extensions/common/permissions/usb_device_permission_unittest.cc
index ee929326046cce45af29dd510d4e84b338fcdab2..25d3137e061deea589f9e362fa276671fe687f29 100644
--- a/extensions/common/permissions/usb_device_permission_unittest.cc
+++ b/extensions/common/permissions/usb_device_permission_unittest.cc
@@ -27,13 +27,7 @@ TEST(USBDevicePermissionTest, PermissionDataOrder) {
             UsbDevicePermissionData(0x02ad, 0x138c, 0));
 }
 
-#if defined(ENABLE_EXTENSIONS)
-#define MAYBE_PermissionMessage PermissionMessage
-#else
-#define MAYBE_PermissionMessage DISABLED_PermissionMessage
-#endif  // defined(ENABLE_EXTENSIONS)
-
-TEST(USBDevicePermissionTest, MAYBE_PermissionMessage) {
+TEST(USBDevicePermissionTest, PermissionMessage) {
   const char* const kMessages[] = {
       "Access the USB device PVR Mass Storage from HUMAX Co., Ltd.",
       "Access the USB device from HUMAX Co., Ltd.",