Disable fd/handle sharing in base::ReadFileToString.

base/files/file_util.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 "base/files/file_util.h"
 
 #if defined(OS_WIN)
 #include <io.h>
 #endif
 #include <stdio.h>
@@ skipping 113 matching lines @@
 }
 #endif  // !defined(OS_NACL_NONSFI)
 
 bool ReadFileToStringWithMaxSize(const FilePath& path,
                                  std::string* contents,
                                  size_t max_size) {
   if (contents)
     contents->clear();
   if (path.ReferencesParent())
     return false;
-  FILE* file = OpenFile(path, "rb");
+  FILE* file = OpenFile(path, "rb" FONE);
   if (!file) {
     return false;
   }
 
   const size_t kBufferSize = 1 << 16;
   std::unique_ptr<char[]> buf(new char[kBufferSize]);
   size_t len;
   size_t size = 0;
   bool read_status = true;
 
@@ skipping 109 matching lines @@
         (!have_suffix || !PathExists(FilePath(new_path.value() + suffix)))) {
       return count;
     }
   }
 
   return -1;
 }
 #endif  // !defined(OS_NACL_NONSFI)
 
 }  // namespace base