IWYU fixes in /chrome/credential_provider.

base/win/registry.h includes more than it uses. These files were
inadvertently relying on that fact. This CL adds missing includes so
that registry.h can be cleaned up.

BUG=None
This CL was uploaded by git cl split.

R=rogerta@chromium.org

Change-Id: I212f88b802f2fc159938f2cc3ac5bff86d4b84ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2475035
Commit-Queue: Roger Tawa <rogerta@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Auto-Submit: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817491}

chrome/credential_provider/gaiacp/gcp_crash_reporter_client.cc

@@ -4,8 +4,10 @@
 
 #include "chrome/credential_provider/gaiacp/gcp_crash_reporter_client.h"
 
+#include "base/check.h"
 #include "base/file_version_info.h"
 #include "base/files/file_path.h"
+#include "base/notreached.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/registry.h"
 #include "build/branding_buildflags.h"