Move js_files_for_form_controls_web_tests target out of core/html

I'm working on getting rid of as many renderer/core/*/BUILD.gn files as
possible, and this one was getting in the way.

Bug: 800764
Change-Id: Ie29c2e750aec9459cb17c9aa2da32219e03d3068
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470659Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817119}

BUILD.gn

@@ -1064,7 +1064,7 @@ if (!is_ios) {
       "//third_party/blink/public:blink_devtools_frontend_resources_files",
       "//third_party/blink/public:blink_devtools_inspector_resources",
       "//third_party/blink/public/mojom:mojom_platform_js_data_deps",
-      "//third_party/blink/renderer/core/html:js_files_for_form_controls_web_tests",
+      "//third_party/blink/renderer/core:js_files_for_form_controls_web_tests",
       "//third_party/catapult/third_party/typ",
       "//third_party/mesa_headers",
       "//tools/imagediff",

third_party/blink/renderer/core/BUILD.gn

@@ -1503,6 +1503,21 @@ group("unit_tests_data") {
   ]
 }
 
+copy("form_controls_pickers_js") {
+  testonly = true
+
+  sources = [ "html/forms/resources/color_picker.js" ]
+
+  outputs = [ "{{source_gen_dir}}/{{source_file_part}}" ]
+}
+
+group("js_files_for_form_controls_web_tests") {
+  testonly = true
+  visibility = []  # Allow re-assignment of list.
+  visibility = [ "*" ]
+  data_deps = [ ":form_controls_pickers_js" ]
+}
+
 source_set("perf_tests") {
   testonly = true
   sources = [ "layout/visual_rect_mapping_perftest.cc" ]

third_party/blink/renderer/core/html/BUILD.gn

@@ -608,19 +608,6 @@ blink_core_sources("html") {
   ]
 }
 
-copy("form_controls_pickers_js") {
-  testonly = true
-
-  sources = [ "forms/resources/color_picker.js" ]
-
-  outputs = [ "{{source_gen_dir}}/{{source_file_part}}" ]
-}
-
-group("js_files_for_form_controls_web_tests") {
-  testonly = true
-  data_deps = [ ":form_controls_pickers_js" ]
-}
-
 blink_core_tests("unit_tests") {
   sources = [
     "anchor_element_metrics_sender_test.cc",