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

chrome/renderer/app_categorizer.cc

 // 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.
 
 #include "chrome/renderer/app_categorizer.h"
 
 #include "base/macros.h"
 #include "base/strings/string_util.h"
 #include "url/gurl.h"
 
@@ skipping 37 matching lines @@
           kPredefinedHangoutsDomains,
           arraysize(kPredefinedHangoutsDomains));
 }
 
 bool AppCategorizer::IsWhitelistedApp(
     const GURL& manifest_url, const GURL& app_url) {
   // Whitelisted apps must be served over https.
   if (!app_url.SchemeIsCryptographic())
     return false;
 
-  std::string manifest_url_path = manifest_url.path();
+  base::StringPiece manifest_url_path = manifest_url.path();
   bool is_photo_app =
       manifest_url.SchemeIsCryptographic() &&
       manifest_url.DomainIs("ssl.gstatic.com") &&
       (base::StartsWith(manifest_url_path, "/s2/oz/nacl/",
                         base::CompareCase::SENSITIVE) ||
        base::StartsWith(manifest_url_path, "/photos/nacl/",
                         base::CompareCase::SENSITIVE)) &&
       IsInWhitelistedDomain(
           app_url,
           kPredefinedPlusDomains,
           arraysize(kPredefinedPlusDomains));
 
   bool is_hangouts_app =
       manifest_url.SchemeIsFileSystem() &&
       manifest_url.inner_url() != NULL &&
       manifest_url.inner_url()->SchemeIsCryptographic() &&
       // The manifest must be loaded from the host's FileSystem.
       (manifest_url.inner_url()->host() == app_url.host()) &&
       IsHangoutsUrl(app_url);
 
   return is_photo_app || is_hangouts_app;
 }