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

extensions/browser/extension_navigation_throttle.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 "extensions/browser/extension_navigation_throttle.h"
 
 #include "components/guest_view/browser/guest_view_base.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 62 matching lines @@
           registry->enabled_extensions().GetExtensionOrAppByURL(url);
       guest_view::GuestViewBase* guest =
           guest_view::GuestViewBase::FromWebContents(web_contents);
       if (guest) {
         std::string owner_extension_id = guest->owner_host();
         const Extension* owner_extension =
             registry->enabled_extensions().GetByID(owner_extension_id);
 
         std::string partition_domain, partition_id;
         bool in_memory;
-        std::string resource_path = url.path();
+        std::string resource_path = url.path().as_string();
         bool is_guest = WebViewGuest::GetGuestPartitionConfigForSite(
             navigation_handle()->GetStartingSiteInstance()->GetSiteURL(),
             &partition_domain, &partition_id, &in_memory);
 
         bool allowed = true;
         url_request_util::AllowCrossRendererResourceLoadHelper(
             is_guest, extension, owner_extension, partition_id, resource_path,
             navigation_handle()->GetPageTransition(), &allowed);
         if (!allowed)
           return content::NavigationThrottle::CANCEL;
@@ skipping 42 matching lines @@
       }
     }
     ancestor = ancestor->GetParent();
   }
 
   if (!external_ancestor)
     return content::NavigationThrottle::PROCEED;
 
   // Since there was at least one origin different than the navigation URL,
   // explicitly check for the resource in web_accessible_resources.
-  std::string resource_path = url.path();
+  base::StringPiece resource_path = url.path();
   if (!registry)
     return content::NavigationThrottle::BLOCK_REQUEST;
 
   const extensions::Extension* extension =
       registry->enabled_extensions().GetByID(url.host());
   if (!extension)
     return content::NavigationThrottle::BLOCK_REQUEST;
 
-  if (WebAccessibleResourcesInfo::IsResourceWebAccessible(extension,
-                                                          resource_path)) {
+  if (WebAccessibleResourcesInfo::IsResourceWebAccessible(
+          extension, resource_path.as_string())) {
     return content::NavigationThrottle::PROCEED;
   }
 
   return content::NavigationThrottle::BLOCK_REQUEST;
 }
 
 }  // namespace extensions