Avoid parsing the webstore base url so much.

extensions/test/test_extensions_client.h

 // 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.
 
 #ifndef EXTENSIONS_TEST_TEST_EXTENSIONS_CLIENT_H_
 #define EXTENSIONS_TEST_TEST_EXTENSIONS_CLIENT_H_
 
 #include "base/macros.h"
 #include "extensions/common/extensions_client.h"
 #include "url/gurl.h"
@@ skipping 31 matching lines @@
   void SetScriptingWhitelist(const ScriptingWhitelist& whitelist) override;
   const ScriptingWhitelist& GetScriptingWhitelist() const override;
   URLPatternSet GetPermittedChromeSchemeHosts(
       const Extension* extension,
       const APIPermissionSet& api_permissions) const override;
   bool IsScriptableURL(const GURL& url, std::string* error) const override;
   bool IsAPISchemaGenerated(const std::string& name) const override;
   base::StringPiece GetAPISchema(const std::string& name) const override;
   bool ShouldSuppressFatalErrors() const override;
   void RecordDidSuppressFatalError() override;
-  std::string GetWebstoreBaseURL() const override;
+  const GURL& GetWebstoreBaseURL() const override;
   const GURL& GetWebstoreUpdateURL() const override;
   bool IsBlacklistUpdateURL(const GURL& url) const override;
   std::set<base::FilePath> GetBrowserImagePaths(
       const Extension* extension) override;
 
   // A whitelist of extensions that can script anywhere. Do not add to this
   // list (except in tests) without consulting the Extensions team first.
   // Note: Component extensions have this right implicitly and do not need to be
   // added to this list.
   ScriptingWhitelist scripting_whitelist_;
 
   std::set<BrowserImagePathsFilter*> browser_image_filters_;
 
+  const GURL webstore_base_url_;
   const GURL webstore_update_url_;
 
   DISALLOW_COPY_AND_ASSIGN(TestExtensionsClient);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_TEST_TEST_EXTENSIONS_CLIENT_H_