[WIP] make GURL::path() return a StringPiece

chrome/browser/ui/webui/chromeos/login/oobe_ui.cc

 // Copyright (c) 2012 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/ui/webui/chromeos/login/oobe_ui.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 161 matching lines @@
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   const bool is_running_test = command_line->HasSwitch(::switches::kTestName) ||
                                command_line->HasSwitch(::switches::kTestType);
   if (is_running_test)
     source->SetRequestFilter(::test::GetTestFilesRequestFilter());
 
   return source;
 }
 
 std::string GetDisplayType(const GURL& url) {
-  std::string path = url.path().size() ? url.path().substr(1) : "";
+  std::string path = url.path().size() ? url.path().substr(1).as_string() : "";
   if (std::find(kKnownDisplayTypes,
                 kKnownDisplayTypes + arraysize(kKnownDisplayTypes),
                 path) == kKnownDisplayTypes + arraysize(kKnownDisplayTypes)) {
     LOG(ERROR) << "Unknown display type '" << path << "'. Setting default.";
     return OobeUI::kLoginDisplay;
   }
   return path;
 }
 
 }  // namespace
@@ skipping 406 matching lines @@
     // http://crbug.com/646034.
     NOTIMPLEMENTED();
   }
 
   current_screen_ = new_screen;
   for (Observer& observer : observer_list_)
     observer.OnCurrentScreenChanged(current_screen_, new_screen);
 }
 
 }  // namespace chromeos