Remove all_devtools_files.gni

The LightHouse and locales variables are inlined in their respective
BUILD.gn file. The `all_devtools_files` variable is obsolete, as
we already set `data` on all `legacy_test_runner` BUILD.gn targets
themselves.

[email protected]

Bug: none
Change-Id: I32376984af36de801a07e51cb7eec2006cce6d79
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3344907
Commit-Queue: Tim Van der Lippe <[email protected]>
Auto-Submit: Tim Van der Lippe <[email protected]>
Reviewed-by: Simon Zünd <[email protected]>
Commit-Queue: Simon Zünd <[email protected]>
diff --git a/BUILD.gn b/BUILD.gn
index e043478..6630165 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2,7 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("./config/gni/all_devtools_files.gni")
 import("./config/gni/devtools_grd_files.gni")
 import("./config/gni/devtools_image_files.gni")
 import("./front_end/emulated_devices/optimized/optimized_images.gni")
@@ -19,8 +18,7 @@
 
 group("devtools_all_files") {
   testonly = true
-  data = all_devtools_files
-  data += [
+  data = [
     # This enables us to test bots with whitespace changes.
     "scripts/whitespaces.txt",
   ]