Remove unused using decls.

Bug: 121209395
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,misc-unused-using-decls
Change-Id: I42d89c904c562ea2860510844c139b93ebee4637
diff --git a/bpfloader/BpfLoader.cpp b/bpfloader/BpfLoader.cpp
index a09af29..169ff4c 100644
--- a/bpfloader/BpfLoader.cpp
+++ b/bpfloader/BpfLoader.cpp
@@ -50,7 +50,6 @@
 
 using android::base::EndsWith;
 using android::base::unique_fd;
-using android::netdutils::Slice;
 using std::string;
 
 #define BPF_PROG_PATH "/system/etc/bpf/"
diff --git a/libbpf_android/BpfUtils.cpp b/libbpf_android/BpfUtils.cpp
index f6b0135..9e2ff44 100644
--- a/libbpf_android/BpfUtils.cpp
+++ b/libbpf_android/BpfUtils.cpp
@@ -42,7 +42,6 @@
 using android::base::unique_fd;
 using android::netdutils::MemBlock;
 using android::netdutils::Slice;
-using android::netdutils::statusFromErrno;
 
 constexpr size_t LOG_BUF_SIZE = 65536;