Re-enable all the windows warnings except 4267

fpdfsdk/fpdfview.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "public/fpdfview.h"
 
 #include <memory>
 
@@ skipping 373 matching lines @@
 
   void Release() override { delete this; }
   FX_FILESIZE GetSize() override { return m_size; }
   FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
     if (offset < 0) {
       return FALSE;
     }
     FX_SAFE_FILESIZE newPos =
         pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
     newPos += offset;
-    if (!newPos.IsValid() || newPos.ValueOrDie() > (uint32_t)m_size) {
+    if (!newPos.IsValid() || newPos.ValueOrDie() > m_size) {
       return FALSE;
     }
     FXSYS_memcpy(buffer, m_pBuf + offset, size);
     return TRUE;
   }
 
  private:
   ~CMemFile() override {}
 
   uint8_t* const m_pBuf;
@@ skipping 743 matching lines @@
   if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) {
     pDestObj = pDict->GetArrayBy("D");
     if (!pDestObj)
       return nullptr;
   }
   if (!pDestObj->IsArray())
     return nullptr;
 
   CFX_WideString wsName = PDF_DecodeText(bsName);
   CFX_ByteString utf16Name = wsName.UTF16LE_Encode();
-  unsigned int len = utf16Name.GetLength();
+  int len = utf16Name.GetLength();
   if (!buffer) {
     *buflen = len;
   } else if (*buflen >= len) {
     memcpy(buffer, utf16Name.c_str(), len);
     *buflen = len;
   } else {
     *buflen = -1;
   }
   return (FPDF_DEST)pDestObj;
 }