Make ExtensionIconSet::ContainsPath use StringPiece.

extensions/browser/url_request_util.cc

 // Copyright 2014 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/url_request_util.h"
 
 #include <string>
 
 #include "content/public/browser/resource_request_info.h"
 #include "content/public/common/browser_side_navigation_policy.h"
@@ skipping 49 matching lines @@
   // checks.
   if (!extension) {
     *allowed = true;
     return true;
   }
 
   // Disallow loading of packaged resources for hosted apps. We don't allow
   // hybrid hosted/packaged apps. The one exception is access to icons, since
   // 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);
+  base::StringPiece resource_root_relative_path =
+      request->url().path_piece().empty()
+          ? base::StringPiece()
+          : request->url().path_piece().substr(1);
   if (extension->is_hosted_app() &&
       !IconsInfo::GetIcons(extension)
            .ContainsPath(resource_root_relative_path)) {
     LOG(ERROR) << "Denying load of " << request->url().spec() << " from "
                << "hosted app.";
     *allowed = false;
     return true;
   }
 
   DCHECK_EQ(extension->url(), request->url().GetWithEmptyPath());
@@ skipping 80 matching lines @@
   if (is_guest && !ui::PageTransitionIsWebTriggerable(page_transition)) {
     *allowed = false;
     return true;
   }
 
   return false;
 }
 
 }  // namespace url_request_util
 }  // namespace extensions