gn2bp: Fix cronet_aml_java srcs path

Remove the leading "//" by using gn_utils.label_to_path

Test: m cronet_aml_net_net
Change-Id: Ibdacb9eeee4115e423ff291f014119efeb4706e3
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index 88a7463..aa7cdd8 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -1147,7 +1147,7 @@
 def create_java_module(blueprint, gn):
   bp_module_name = module_prefix + 'java'
   module = Module('java_library', bp_module_name, '//gn:java')
-  module.srcs.update(gn.java_sources)
+  module.srcs.update([gn_utils.label_to_path(source) for source in gn.java_sources])
   blueprint.add_module(module)
 
 def create_blueprint_for_targets(gn, desc, targets):