Negative check for a HANDLE is invalid.

kInvalidPlatformFileValue is the invalid platform file handle.

BUG=271533

Review URL: https://chromiumcodereview.appspot.com/22841004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@217103 0039d316-1c4b-4281-b951-d872f2087c98

base/platform_file_win.cc

@@ -121,7 +121,7 @@ int64 SeekPlatformFile(PlatformFile file,
                        PlatformFileWhence whence,
                        int64 offset) {
   base::ThreadRestrictions::AssertIOAllowed();
-  if (file < 0 || offset < 0)
+  if (file == kInvalidPlatformFileValue || offset < 0)
     return -1;
 
   LARGE_INTEGER distance, res;