Remove THIRD_PARTY from header guards in Crubit

PiperOrigin-RevId: 435336665
diff --git a/lifetime_annotations/function_lifetimes.h b/lifetime_annotations/function_lifetimes.h
index 335bf51..0c80c0c 100644
--- a/lifetime_annotations/function_lifetimes.h
+++ b/lifetime_annotations/function_lifetimes.h
@@ -2,8 +2,8 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-#ifndef THIRD_PARTY_CRUBIT_LIFETIME_ANNOTATIONS_FUNCTION_LIFETIMES_H_
-#define THIRD_PARTY_CRUBIT_LIFETIME_ANNOTATIONS_FUNCTION_LIFETIMES_H_
+#ifndef CRUBIT_LIFETIME_ANNOTATIONS_FUNCTION_LIFETIMES_H_
+#define CRUBIT_LIFETIME_ANNOTATIONS_FUNCTION_LIFETIMES_H_
 
 #include <iosfwd>
 #include <string>
@@ -76,4 +76,4 @@
 
 }  // namespace devtools_rust
 
-#endif  // THIRD_PARTY_CRUBIT_LIFETIME_ANNOTATIONS_FUNCTION_LIFETIMES_H_
+#endif  // CRUBIT_LIFETIME_ANNOTATIONS_FUNCTION_LIFETIMES_H_