Issue 71980: Extensions code should use UTF-16 for user-visible Unicode strings

chrome/common/chrome_utility_messages.h

 // Copyright (c) 2011 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.
 
 // Multiply-included message file, so no include guard.
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 91 matching lines @@
 // is the parsed manifest.json file.
 // The unpacker should also have written out files containing the decoded
 // images and message catalogs from the extension. See ExtensionUnpacker for
 // details.
 IPC_MESSAGE_CONTROL1(ChromeUtilityHostMsg_UnpackExtension_Succeeded,
                      DictionaryValue /* manifest */)
 
 // Reply when the utility process has failed while unpacking an extension.
 // |error_message| is a user-displayable explanation of what went wrong.
 IPC_MESSAGE_CONTROL1(ChromeUtilityHostMsg_UnpackExtension_Failed,
-                     std::string /* error_message, if any */)
+                     string16 /* error_message, if any */)
 
 // Reply when the utility process is done unpacking and parsing JSON data
 // from a web resource.
 IPC_MESSAGE_CONTROL1(ChromeUtilityHostMsg_UnpackWebResource_Succeeded,
                      DictionaryValue /* json data */)
 
 // Reply when the utility process has failed while unpacking and parsing a
 // web resource.  |error_message| is a user-readable explanation of what
 // went wrong.
 IPC_MESSAGE_CONTROL1(ChromeUtilityHostMsg_UnpackWebResource_Failed,
@@ skipping 39 matching lines @@
 // Reply when the utility process has succeeded in obtaining the printer
 // capabilities and defaults.
 IPC_MESSAGE_CONTROL2(ChromeUtilityHostMsg_GetPrinterCapsAndDefaults_Succeeded,
                      std::string /* printer name */,
                      printing::PrinterCapsAndDefaults)
 
 // Reply when the utility process has failed to obtain the printer
 // capabilities and defaults.
 IPC_MESSAGE_CONTROL1(ChromeUtilityHostMsg_GetPrinterCapsAndDefaults_Failed,
                      std::string /* printer name */)