app_shell: Extend identity API stub

extensions/shell/browser/api/identity/identity_api.h

Index: extensions/shell/browser/api/identity/identity_api.h
diff --git a/extensions/shell/browser/api/identity/identity_api.h b/extensions/shell/browser/api/identity/identity_api.h
index acfc2dbffc52f4a04c521618592282fcf3bdccb5..38bf1772fb50996ad2e3e1111e4414b35f1b9f35 100644
--- a/extensions/shell/browser/api/identity/identity_api.h
+++ b/extensions/shell/browser/api/identity/identity_api.h
@@ -41,6 +41,23 @@ class IdentityGetAuthTokenFunction : public UIThreadExtensionFunction,
   DISALLOW_COPY_AND_ASSIGN(IdentityGetAuthTokenFunction);
 };
 
+// Stub. See the IDL file for documentation.
+class IdentityRemoveCachedAuthTokenFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("identity.removeCachedAuthToken", UNKNOWN)
+
+  IdentityRemoveCachedAuthTokenFunction();
+
+ protected:
+  ~IdentityRemoveCachedAuthTokenFunction() override;
+
+  // ExtensionFunction:
+  ResponseAction Run() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(IdentityRemoveCachedAuthTokenFunction);
+};
+
 }  // namespace shell
 }  // namespace extensions