Revert 112083 - Try a different library for Crc32.

BUG=
TEST=


Review URL: http://codereview.chromium.org/8569018

TBR=dgarrett@chromium.org
Review URL: http://codereview.chromium.org/8742002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112104 0039d316-1c4b-4281-b951-d872f2087c98

courgette/crc.cc

@@ -1,34 +1,22 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2009 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.
 
+// Calculate Crc by calling CRC method in LZMA SDK
+
 #include "courgette/crc.h"
 
-#ifdef OS_CHROMEOS
-#  include "zlib.h"
-#else
 extern "C" {
-#  include "third_party/lzma_sdk/7zCrc.h"
+#include "third_party/lzma_sdk/7zCrc.h"
 }
-#endif
-
-#include "base/basictypes.h"
 
 namespace courgette {
 
 uint32 CalculateCrc(const uint8* buffer, size_t size) {
-  uint32 crc;
-
-#ifdef OS_CHROMEOS
-  // Calculate Crc by calling CRC method in zlib
-  crc = crc32(0, buffer, size);
-#else
-  // Calculate Crc by calling CRC method in LZMA SDK
   CrcGenerateTable();
-  crc = CrcCalc(buffer, size);
-#endif
-
-  return ~crc;
+  uint32 crc = 0xffffffffL;
+  crc = ~CrcCalc(buffer, size);
+  return crc;
 }
 
 }  // namespace