gn2bp: Fix output for protoc_wrapper.py

Test: m cronet_aml_net_net_nqe_proto_gen
Change-Id: I6c1ce35381390929e175a302cf3304ddd19f5353
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index c57011c..f157b22 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -859,6 +859,7 @@
   elif target.script == "//tools/protoc_wrapper/protoc_wrapper.py":
     # Use protoc in the android
     module.tools.add("aprotoc")
+    target.outputs = [re.sub('^//out/test/', '', out) for out in target.outputs]
     for i, val in enumerate(target.args):
       if val == '--protoc':
         target.args[i + 1] = '$(location aprotoc)'