Fix case-sensitivity problems in extension content verification

extensions/browser/content_hash_reader.cc

 // Copyright 2014 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 "extensions/browser/content_hash_reader.h"
 
 #include "base/base64.h"
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/metrics/histogram.h"
@@ skipping 67 matching lines @@
   ComputedHashes::Reader reader;
   if (!reader.InitFromFile(computed_hashes_path))
     return false;
 
   have_computed_hashes_ = true;
 
   if (!reader.GetHashes(relative_path_, &block_size_, &hashes_) ||
       block_size_ % crypto::kSHA256Length != 0)
     return false;
 
-  const std::string* expected_root =
-      verified_contents_->GetTreeHashRoot(relative_path_);
-  if (!expected_root)
-    return false;
-
   std::string root =
       ComputeTreeHashRoot(hashes_, block_size_ / crypto::kSHA256Length);
-  if (*expected_root != root)
+  if (!verified_contents_->TreeHashRootEquals(relative_path_, root))
     return false;
 
   status_ = SUCCESS;
   UMA_HISTOGRAM_TIMES("ExtensionContentHashReader.InitLatency",
                       timer.Elapsed());
   return true;
 }
 
 int ContentHashReader::block_count() const {
   DCHECK(status_ != NOT_INITIALIZED);
@@ skipping 12 matching lines @@
   DCHECK(block_index >= 0);
 
   if (static_cast<unsigned>(block_index) >= hashes_.size())
     return false;
   *result = &hashes_[block_index];
 
   return true;
 }
 
 }  // namespace extensions