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

ui/base/dragdrop/os_exchange_data_provider_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/dragdrop/os_exchange_data_provider_win.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/file_path.h"
@@ skipping 946 matching lines @@
 static STGMEDIUM* GetStorageForFileDescriptor(
     const FilePath& path) {
   string16 file_name = path.value();
   DCHECK(!file_name.empty());
   HANDLE hdata = GlobalAlloc(GPTR, sizeof(FILEGROUPDESCRIPTOR));
   base::win::ScopedHGlobal<FILEGROUPDESCRIPTOR> locked_mem(hdata);
 
   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;
   storage->hGlobal = hdata;
   storage->pUnkForRelease = NULL;
   return storage;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // OSExchangeData, public:
 
 // static
 OSExchangeData::Provider* OSExchangeData::CreateProvider() {
   return new OSExchangeDataProviderWin();
 }
 
 // static
 OSExchangeData::CustomFormat OSExchangeData::RegisterCustomFormat(
     const std::string& type) {
   return RegisterClipboardFormat(ASCIIToUTF16(type).c_str());
 }
 
 }  // namespace ui