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

extensions/browser/url_request_util.cc

Index: extensions/browser/url_request_util.cc
diff --git a/extensions/browser/url_request_util.cc b/extensions/browser/url_request_util.cc
index 28d863389078857b11a65b32410543a20e7d433a..95b9131c7749b7ec1547226a5b000bc2ffefa579 100644
--- a/extensions/browser/url_request_util.cc
+++ b/extensions/browser/url_request_util.cc
@@ -28,7 +28,7 @@ bool AllowCrossRendererResourceLoad(net::URLRequest* request,
                                     bool* allowed) {
   const content::ResourceRequestInfo* info =
       content::ResourceRequestInfo::ForRequest(request);
-  std::string resource_path = request->url().path();
+  base::StringPiece resource_path = request->url().path();
 
   // PlzNavigate: this logic is performed for main frame requests in
   // ExtensionNavigationThrottle::WillStartRequest.
@@ -49,8 +49,8 @@ bool AllowCrossRendererResourceLoad(net::URLRequest* request,
         info->GetChildID(), &partition_id);
 
     if (AllowCrossRendererResourceLoadHelper(
-            is_guest, extension, owner_extension, partition_id, resource_path,
-            info->GetPageTransition(), allowed)) {
+            is_guest, extension, owner_extension, partition_id,
+            resource_path.as_string(), info->GetPageTransition(), allowed)) {
       return true;
     }
   }
@@ -68,8 +68,9 @@ bool AllowCrossRendererResourceLoad(net::URLRequest* request,
   // some extensions want to be able to do things like create their own
   // launchers.
   std::string resource_root_relative_path =
-      request->url().path().empty() ? std::string()
-                                    : request->url().path().substr(1);
+      request->url().path().empty()
+          ? std::string()
+          : request->url().path().substr(1).as_string();
   if (extension->is_hosted_app() &&
       !IconsInfo::GetIcons(extension)
            .ContainsPath(resource_root_relative_path)) {
@@ -103,8 +104,8 @@ bool AllowCrossRendererResourceLoad(net::URLRequest* request,
     }
 
     // Also allow if the file is explicitly listed as a web_accessible_resource.
-    if (WebAccessibleResourcesInfo::IsResourceWebAccessible(extension,
-                                                            resource_path)) {
+    if (WebAccessibleResourcesInfo::IsResourceWebAccessible(
+            extension, resource_path.as_string())) {
       *allowed = true;
       return true;
     }