Enable gn check for chrome/credential_provider/gaiacp

gcp_utils.h / win_http_url_fetcher.h (in "common") includes
scoped_lsa_policy.h / scoped_handle.h [respectively] (in "gaiacp_lib").
"gaiacp_lib" depends on "common".
So, moving scoped_lsa_policy.{cc,h} / scoped_handle.h to "common".

This allows us to enable gn check for all of credential_provider.

Bug: 898837
Change-Id: I13aaad5f75183bc5149772d0658210fd75e5d50f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377527
Commit-Queue: Erik Staab <estaab@chromium.org>
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Yusuf Sengul <yusufsn@google.com>
Cr-Commit-Position: refs/heads/master@{#802555}

.gn

@@ -73,7 +73,6 @@ no_check_targets = [
   "//chrome/browser/updates:*",  # 21 errors
   "//chrome/browser:*",  # 780 errors
   "//chrome/child:*",  # 3 errors
-  "//chrome/credential_provider/gaiacp:*",  # 1 error
   "//chrome/install_static:*",  # 4 errors
   "//chrome/notification_helper:*",  # 4 errors
   "//chrome/renderer:*",  # 42 errors

chrome/credential_provider/gaiacp/BUILD.gn

@@ -38,6 +38,9 @@ source_set("common") {
     "os_user_manager.h",
     "reg_utils.cc",
     "reg_utils.h",
+    "scoped_handle.h",
+    "scoped_lsa_policy.cc",
+    "scoped_lsa_policy.h",
     "user_policies.cc",
     "user_policies.h",
     "user_policies_manager.cc",
@@ -118,9 +121,6 @@ source_set("gaiacp_lib") {
     "password_recovery_manager.h",
     "reauth_credential.cc",
     "reauth_credential.h",
-    "scoped_handle.h",
-    "scoped_lsa_policy.cc",
-    "scoped_lsa_policy.h",
     "scoped_user_profile.cc",
     "scoped_user_profile.h",
     "stdafx.h",