[extensions] Stop parsing webstore urls so much

extensions/test/test_extensions_client.cc

Index: extensions/test/test_extensions_client.cc
diff --git a/extensions/test/test_extensions_client.cc b/extensions/test/test_extensions_client.cc
index 600bc2d9892887766c68e2ec78d8b57c11b8fcfd..6f223feaa9f512aa4ed4b0c07a43e702143f5802 100644
--- a/extensions/test/test_extensions_client.cc
+++ b/extensions/test/test_extensions_client.cc
@@ -37,8 +37,8 @@ SimpleFeature* CreateFeature() {
 
 }  // namespace
 
-TestExtensionsClient::TestExtensionsClient() {
-}
+TestExtensionsClient::TestExtensionsClient()
+    : webstore_update_url_(extension_urls::kChromeWebstoreUpdateURL) {}
 
 TestExtensionsClient::~TestExtensionsClient() {
 }
@@ -151,8 +151,8 @@ std::string TestExtensionsClient::GetWebstoreBaseURL() const {
   return extension_urls::kChromeWebstoreBaseURL;
 }
 
-std::string TestExtensionsClient::GetWebstoreUpdateURL() const {
-  return extension_urls::kChromeWebstoreUpdateURL;
+const GURL& TestExtensionsClient::GetWebstoreUpdateURL() const {
+  return webstore_update_url_;
 }
 
 bool TestExtensionsClient::IsBlacklistUpdateURL(const GURL& url) const {