Fixes for re-enabling more MSVC level 4 warnings: base/ edition

base/basictypes.h

 // Copyright 2013 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.
 
 // This file contains definitions of our old basic integral types
 // ((u)int{8,16,32,64}) and further includes. I recommend that you use the C99
 // standard types instead, and include <stdint.h>/<stddef.h>/etc. as needed.
 // Note that the macros and macro-like constructs that were formerly defined in
 // this file are now available separately in base/macros.h.
 
@@ skipping 24 matching lines @@
 // <inttypes.h> format macros even in the LP64 model.
 #if defined(__LP64__) && !defined(OS_MACOSX) && !defined(OS_OPENBSD)
 typedef long int64;
 typedef unsigned long uint64;
 #else
 typedef long long int64;
 typedef unsigned long long uint64;
 #endif
 
 // DEPRECATED: Please use std::numeric_limits (from <limits>) instead.
-const uint8  kuint8max  = (( uint8) 0xFF);
-const uint16 kuint16max = ((uint16) 0xFFFF);
-const uint32 kuint32max = ((uint32) 0xFFFFFFFF);
-const uint64 kuint64max = ((uint64) 0xFFFFFFFFFFFFFFFFULL);
-const  int8  kint8min   = ((  int8) 0x80);
-const  int8  kint8max   = ((  int8) 0x7F);
-const  int16 kint16min  = (( int16) 0x8000);
-const  int16 kint16max  = (( int16) 0x7FFF);
-const  int32 kint32min  = (( int32) 0x80000000);
-const  int32 kint32max  = (( int32) 0x7FFFFFFF);
-const  int64 kint64min  = (( int64) 0x8000000000000000LL);
-const  int64 kint64max  = (( int64) 0x7FFFFFFFFFFFFFFFLL);
+const uint8  kuint8max  =  0xFF;
+const uint16 kuint16max =  0xFFFF;
+const uint32 kuint32max =  0xFFFFFFFF;
+const uint64 kuint64max =  0xFFFFFFFFFFFFFFFFULL;
+const  int8  kint8min   = -0x7F - 1;
+const  int8  kint8max   =  0x7F;
+const  int16 kint16min  = -0x7FFF - 1;
+const  int16 kint16max  =  0x7FFF;
+const  int32 kint32min  = -0x7FFFFFFF - 1;
+const  int32 kint32max  =  0x7FFFFFFF;
+const  int64 kint64min  = -0x7FFFFFFFFFFFFFFFLL - 1;
+const  int64 kint64max  =  0x7FFFFFFFFFFFFFFFLL;
 
 #endif  // BASE_BASICTYPES_H_