Prevent hitting DCHECK when multiple slashes are specified in chrome://devtoo...

chrome/browser/dom_ui/chrome_url_data_manager.cc

 // Copyright (c) 2010 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 "chrome/browser/dom_ui/chrome_url_data_manager.h"
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
 #include "base/i18n/rtl.h"
 #include "base/message_loop.h"
@@ skipping 151 matching lines @@
   replacements.ClearRef();
   stripped_url = url.ReplaceComponents(replacements);
 
   URLToRequest(stripped_url, &source_name, &relative_path);
 
   FileSourceMap::const_iterator i(
       Singleton<ChromeURLDataManager>()->file_sources_.find(source_name));
   if (i == Singleton<ChromeURLDataManager>()->file_sources_.end())
     return false;
 
+  // Check that |relative_path| is not an absolute path (otherwise AppendASCII()
+  // will DCHECK). The awkward use of StringType is because on some systems
+  // FilePath expects a std::string, but on others a std::wstring.
+  FilePath p(FilePath::StringType(relative_path.begin(), relative_path.end()));
+  if (p.IsAbsolute())
+    return false;
+
   *file_path = i->second.AppendASCII(relative_path);
 
   return true;
 }
 
 ChromeURLDataManager::ChromeURLDataManager() : next_request_id_(0) { }
 
 ChromeURLDataManager::~ChromeURLDataManager() { }
 
 void ChromeURLDataManager::AddDataSource(scoped_refptr<DataSource> source) {
@@ skipping 231 matching lines @@
                                       net::ERR_INVALID_URL));
   }
 }
 
 URLRequestChromeFileJob::URLRequestChromeFileJob(URLRequest* request,
                                                  const FilePath& path)
     : URLRequestFileJob(request, path) {
 }
 
 URLRequestChromeFileJob::~URLRequestChromeFileJob() { }