Use -Werror in frameworks/base/tools/streaming_proto

* Remove unused constants.

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I43940e8c446bab25b8fa841ec8c17885ab5d88ed
diff --git a/tools/streaming_proto/Android.bp b/tools/streaming_proto/Android.bp
index dc5c14e..4e9391d 100644
--- a/tools/streaming_proto/Android.bp
+++ b/tools/streaming_proto/Android.bp
@@ -24,6 +24,10 @@
         "stream_proto_utils.cpp",
         "string_utils.cpp",
     ],
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
 
     shared_libs: ["libprotoc"],
 }
diff --git a/tools/streaming_proto/stream_proto_utils.cpp b/tools/streaming_proto/stream_proto_utils.cpp
index e8f86bc..fb2d98d 100644
--- a/tools/streaming_proto/stream_proto_utils.cpp
+++ b/tools/streaming_proto/stream_proto_utils.cpp
@@ -13,8 +13,6 @@
 // TODO: packed is not supported yet.
 //
 const uint64_t FIELD_COUNT_SHIFT = 40;
-const uint64_t FIELD_COUNT_MASK = 0x0fULL << FIELD_COUNT_SHIFT;
-const uint64_t FIELD_COUNT_UNKNOWN = 0;
 const uint64_t FIELD_COUNT_SINGLE = 1ULL << FIELD_COUNT_SHIFT;
 const uint64_t FIELD_COUNT_REPEATED = 2ULL << FIELD_COUNT_SHIFT;
 const uint64_t FIELD_COUNT_PACKED = 5ULL << FIELD_COUNT_SHIFT;