Fix build break for Win64 bot.

This should fix the build break at this bot:
https://build.chromium.org/p/chromium.gpu.fyi/builders/GPU%20Win%20x64%20Builder%20%28dbg%29/builds/9753

R=geofflang@chromium.org
TBR=tbarzic@chromium.org
BUG=None

Review-Url: https://codereview.chromium.org/2338133007
Cr-Commit-Position: refs/heads/master@{#418926}

extensions/browser/api/printer_provider_internal/BUILD.gn

@@ -9,6 +9,11 @@ source_set("printer_provider_internal") {
     "printer_provider_internal_api_observer.h",
   ]
 
+  configs += [
+    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+    "//build/config/compiler:no_size_t_to_int_warning",
+  ]
+
   deps = [
     "//content/public/browser",
     "//extensions/common/api",