pin user32 on startup

https://chromium-review.googlesource.com/c/chromium/src/+/1551709

Loading it later causes a blocking call where blocking calls aren't allowed.

atom/app/atom_main_delegate.cc

@@ -49,6 +49,10 @@
 #include "atom/app/atom_main_delegate_mac.h"
 #endif
 
+#if defined(OS_WIN)
+#include "base/win/win_util.h"
+#endif
+
 namespace atom {
 
 namespace {
@@ -183,6 +187,9 @@ bool AtomMainDelegate::BasicStartupComplete(int* exit_code) {
   // Disable the ActiveVerifier, which is used by Chrome to track possible
   // bugs, but no use in Electron.
   base::win::DisableHandleVerifier();
+
+  if (IsBrowserProcess(command_line))
+    base::win::PinUser32();
 #endif
 
   content_client_ = std::make_unique<AtomContentClient>();