some fixes and warning disables in ui/ for building on win x64

ui/base/dragdrop/os_exchange_data_provider_win.cc

Index: ui/base/dragdrop/os_exchange_data_provider_win.cc
diff --git a/ui/base/dragdrop/os_exchange_data_provider_win.cc b/ui/base/dragdrop/os_exchange_data_provider_win.cc
index 800f81a52fab023852b03099dd2f4ca4d57b16d7..56011219ab06bd11c3a51215cc350cb13c079a52 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_win.cc
+++ b/ui/base/dragdrop/os_exchange_data_provider_win.cc
@@ -964,10 +964,8 @@ static STGMEDIUM* GetStorageForFileDescriptor(
   FILEGROUPDESCRIPTOR* descriptor = locked_mem.get();
   descriptor->cItems = 1;
   descriptor->fgd[0].dwFlags = FD_LINKUI;
-  wcsncpy_s(descriptor->fgd[0].cFileName,
-            MAX_PATH,
-            file_name.c_str(),
-            std::min(file_name.size(), MAX_PATH - 1u));
+  wcsncpy_s(descriptor->fgd[0].cFileName, MAX_PATH, file_name.c_str(),
+            std::min(file_name.size(), static_cast<size_t>(MAX_PATH - 1u)));
 
   STGMEDIUM* storage = new STGMEDIUM;
   storage->tymed = TYMED_HGLOBAL;