[extensions] Stop parsing webstore urls so much

extensions/shell/common/shell_extensions_client.h

Index: extensions/shell/common/shell_extensions_client.h
diff --git a/extensions/shell/common/shell_extensions_client.h b/extensions/shell/common/shell_extensions_client.h
index 1398d8706385b08ba47e8750d951f0b9aff52c60..b9bb22c677013168e59970f815979391cd5e9753 100644
--- a/extensions/shell/common/shell_extensions_client.h
+++ b/extensions/shell/common/shell_extensions_client.h
@@ -9,6 +9,7 @@
 #include "base/macros.h"
 #include "extensions/common/extensions_client.h"
 #include "extensions/common/permissions/extensions_api_permissions.h"
+#include "url/gurl.h"
 
 namespace extensions {
 
@@ -41,7 +42,7 @@ class ShellExtensionsClient : public ExtensionsClient {
   bool ShouldSuppressFatalErrors() const override;
   void RecordDidSuppressFatalError() override;
   std::string GetWebstoreBaseURL() const override;
-  std::string GetWebstoreUpdateURL() const override;
+  const GURL& GetWebstoreUpdateURL() const override;
   bool IsBlacklistUpdateURL(const GURL& url) const override;
 
  private:
@@ -49,6 +50,8 @@ class ShellExtensionsClient : public ExtensionsClient {
 
   ScriptingWhitelist scripting_whitelist_;
 
+  const GURL webstore_update_url_;
+
   DISALLOW_COPY_AND_ASSIGN(ShellExtensionsClient);
 };