win: Add and use GET_FUNCTION() and GET_FUNCTION_REQUIRED()

util/win/exception_handler_server.cc

Index: util/win/exception_handler_server.cc
diff --git a/util/win/exception_handler_server.cc b/util/win/exception_handler_server.cc
index 9cc69e6791c1d1f10429199f3265020e2546ca18..304319b757fbcda6f6eb0d70a56dc077a58a6588 100644
--- a/util/win/exception_handler_server.cc
+++ b/util/win/exception_handler_server.cc
@@ -27,6 +27,7 @@
 #include "util/file/file_writer.h"
 #include "util/misc/tri_state.h"
 #include "util/misc/uuid.h"
+#include "util/win/get_function.h"
 #include "util/win/registration_protocol_win.h"
 #include "util/win/xp_compat.h"
 
@@ -35,10 +36,9 @@ namespace crashpad {
 namespace {
 
 decltype(GetNamedPipeClientProcessId)* GetNamedPipeClientProcessIdFunction() {
-  static decltype(GetNamedPipeClientProcessId)* func =
-      reinterpret_cast<decltype(GetNamedPipeClientProcessId)*>(GetProcAddress(
-          GetModuleHandle(L"kernel32.dll"), "GetNamedPipeClientProcessId"));
-  return func;
+  static const auto get_named_pipe_client_process_id =
+      GET_FUNCTION(L"kernel32.dll", ::GetNamedPipeClientProcessId);
+  return get_named_pipe_client_process_id;
 }
 
 HANDLE DuplicateEvent(HANDLE process, HANDLE event) {