Syntax and coverage checking added to Network Traffic Annotations.

tools/traffic_annotation/auditor/BUILD.gn

Index: tools/traffic_annotation/auditor/BUILD.gn
diff --git a/tools/traffic_annotation/auditor/BUILD.gn b/tools/traffic_annotation/auditor/BUILD.gn
index bd3606fb2f83589be64b522156a01418415316c7..ab53ca4e470eb86eab1e6e06ab910445588ef4a7 100644
--- a/tools/traffic_annotation/auditor/BUILD.gn
+++ b/tools/traffic_annotation/auditor/BUILD.gn
@@ -19,11 +19,11 @@ proto_library("chrome_settings_full_runtime") {
         "/components/policy/proto/chrome_settings_full_runtime.proto",
   ]
 
-  use_protobuf_full = true
+  # use_protobuf_full = true
 
   deps = [
     "//components/policy:full_runtime_code_generate",
-    "//third_party/protobuf:protobuf_full",
+    "//third_party/protobuf:protobuf_lite",
   ]
 }
 
@@ -38,12 +38,12 @@ proto_library("traffic_annotation") {
     ":chrome_settings_full_runtime",
   ]
 
-  use_protobuf_full = true
+  # use_protobuf_full = true
 }
 
 group("traffic_annotation_auditor") {
   deps = [
     ":traffic_annotation",
-    "//third_party/protobuf:protobuf_full",
+    "//third_party/protobuf:protobuf_lite",
   ]
 }