update_engine: Rename "chromeos" -> "brillo" in include paths and namespaces

libchromeos is transitioning to libbrillo and chromeos namespaces
and include directory is changing to brillo.

Bug: 24872993
Change-Id: I770659a95be380a50fe3b2ba9f91d65818f40945
diff --git a/bzip.h b/bzip.h
index 4a0b469..4293526 100644
--- a/bzip.h
+++ b/bzip.h
@@ -20,15 +20,15 @@
 #include <string>
 #include <vector>
 
-#include <chromeos/secure_blob.h>
+#include <brillo/secure_blob.h>
 
 namespace chromeos_update_engine {
 
 // Bzip2 compresses or decompresses str/in to out.
-bool BzipDecompress(const chromeos::Blob& in, chromeos::Blob* out);
-bool BzipCompress(const chromeos::Blob& in, chromeos::Blob* out);
-bool BzipCompressString(const std::string& str, chromeos::Blob* out);
-bool BzipDecompressString(const std::string& str, chromeos::Blob* out);
+bool BzipDecompress(const brillo::Blob& in, brillo::Blob* out);
+bool BzipCompress(const brillo::Blob& in, brillo::Blob* out);
+bool BzipCompressString(const std::string& str, brillo::Blob* out);
+bool BzipDecompressString(const std::string& str, brillo::Blob* out);
 
 }  // namespace chromeos_update_engine