Enable gn check for //third_party/wayland

Bug: 1108003
Change-Id: If664a3b974ef0f110ce18518c5b211ed23e9e7d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310869Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791014}

.gn

@@ -351,7 +351,6 @@ no_check_targets = [
   "//third_party/pdfium/samples:*",  # 1 error
   "//third_party/pdfium/third_party:*",  # 2 errors
   "//third_party/pdfium:*",  # 1 error
-  "//third_party/wayland:*",  # 3 errors
 
   # //v8/*, https://crbug.com/v8/7330
   "//v8/src/inspector:*",  # 20 errors

third_party/wayland/BUILD.gn

@@ -21,6 +21,7 @@ if (!use_system_libwayland) {
     sources = [
       "src/src/wayland-util.c",
       "src/src/wayland-util.h",
+      "src/src/wayland-private.h",
     ]
 
     configs -= [ "//build/config/compiler:chromium_code" ]
@@ -34,9 +35,10 @@ if (!use_system_libwayland) {
       "src/src/connection.c",
       "src/src/wayland-os.c",
       "src/src/wayland-os.h",
-      "src/src/wayland-private.h",
     ]
 
+    deps = [ ":wayland_util" ]
+
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [
       "//build/config/compiler:no_chromium_code",