Allow generation of a chromium outdirs when enable_extensions=false

apps/ui/views/BUILD.gn

Index: apps/ui/views/BUILD.gn
diff --git a/apps/ui/views/BUILD.gn b/apps/ui/views/BUILD.gn
index bd7d9076500e97015631244ce35cb5538de2380b..cd33ee32fdcc766058f97c7fbceb917226bee366 100644
--- a/apps/ui/views/BUILD.gn
+++ b/apps/ui/views/BUILD.gn
@@ -5,8 +5,6 @@
 import("//build/config/ui.gni")
 import("//extensions/features/features.gni")
 
-assert(enable_extensions)
-
 source_set("views") {
   sources = [
     "app_window_frame_view.cc",
@@ -16,11 +14,16 @@ source_set("views") {
   deps = [
     "//cc/paint",
     "//chrome/app/theme:theme_resources",
-    "//extensions/browser/app_window",
-    "//extensions/common",
     "//skia",
     "//ui/gfx",
     "//ui/strings",
     "//ui/views",
   ]
+
+  if (enable_extensions) {
+    deps += [
+      "//extensions/browser/app_window",
+      "//extensions/common",
+    ]
+  }
 }