Misc changes to cert_verify_tool for errors

net/tools/cert_verify_tool/cert_verify_tool_util.h

 // Copyright 2016 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.
 
 #ifndef NET_TOOLS_CERT_VERIFY_TOOL_CERT_VERIFY_TOOL_UTIL_H_
 #define NET_TOOLS_CERT_VERIFY_TOOL_CERT_VERIFY_TOOL_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 15 matching lines @@
   std::string source_details;
 };
 
 // Parses |file_path| as a single DER cert or a PEM certificate list.
 bool ReadCertificatesFromFile(const base::FilePath& file_path,
                               std::vector<CertInput>* certs);
 
 // Parses |file_path| as a DER cert or PEM chain. If more than one cert is
 // present, the first will be used as the target certificate and the rest will
 // be used as intermediates.
-void ReadChainFromFile(const base::FilePath& file_path,
+bool ReadChainFromFile(const base::FilePath& file_path,
                        CertInput* target,
                        std::vector<CertInput>* intermediates);
 
 // Writes a file and prints an error message if it failed.
 bool WriteToFile(const base::FilePath& file_path, const std::string& data);
 
 // Prints an error about the input |cert|. This will include the file the cert
 // was read from, as well as which block in the file if it was a PEM file.
 void PrintCertError(const std::string& error, const CertInput& cert);
 
 #endif  // NET_TOOLS_CERT_VERIFY_TOOL_CERT_VERIFY_TOOL_UTIL_H_