Fix the case where the browser livelocks if we cannot open a file.

base/platform_file_win.cc

 // Copyright (c) 2006-2008 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/platform_file.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
 
 namespace base {
@@ skipping 57 matching lines @@
 
 PlatformFile CreatePlatformFile(const std::wstring& name, int flags,
                                 bool* created) {
   return CreatePlatformFile(FilePath::FromWStringHack(name), flags, created);
 }
 
 bool ClosePlatformFile(PlatformFile file) {
   return (CloseHandle(file) == 0);
 }
 
+bool GetPlatformFileSize(PlatformFile file, uint64* out_size) {
+  LARGE_INTEGER size;
+  if (!GetFileSizeEx(file, &size))
+    return false;
+  *out_size = size.QuadPart;
+  return true;
+}
+
 }  // namespace disk_cache